ExplainPlease Q&A - Recent questions and answers in Trigonometry
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Powered by Question2AnswerThe length of tangent drawn from an external point to a circle are
http://www.explainplease.com/179708/the-length-of-tangent-drawn-from-an-external-point-circle-are
Trigonometryhttp://www.explainplease.com/179708/the-length-of-tangent-drawn-from-an-external-point-circle-areFri, 19 Jan 2018 18:01:43 +0000What is cosine of 32°
http://www.explainplease.com/144180/what-is-cosine-of-32%C2%B0
Trigonometryhttp://www.explainplease.com/144180/what-is-cosine-of-32%C2%B0Wed, 22 Oct 2014 14:20:55 +00002^x + 3 = 17^x round answer to 2 decima places
http://www.explainplease.com/128181/2-x-3-17-x-round-answer-to-2-decima-places
Trigonometryhttp://www.explainplease.com/128181/2-x-3-17-x-round-answer-to-2-decima-placesMon, 24 Mar 2014 21:59:25 +0000draw 2 congruent pentagons
http://www.explainplease.com/121983/draw-2-congruent-pentagons
Trigonometryhttp://www.explainplease.com/121983/draw-2-congruent-pentagonsSun, 02 Mar 2014 23:45:29 +0000I need to learn function tables
http://www.explainplease.com/120784/i-need-to-learn-function-tables
Trigonometryhttp://www.explainplease.com/120784/i-need-to-learn-function-tablesWed, 26 Feb 2014 06:56:59 +0000all solutions to the following equation 3(x-8)^2/3=75
http://www.explainplease.com/108345/all-solutions-to-the-following-equation-3-x-8-2-3-75
Trigonometryhttp://www.explainplease.com/108345/all-solutions-to-the-following-equation-3-x-8-2-3-75Thu, 09 Jan 2014 23:17:37 +0000Sin(7*3.14/6-3.14/3)
http://www.explainplease.com/98992/sin-7-3-14-6-3-14-3
Trigonometryhttp://www.explainplease.com/98992/sin-7-3-14-6-3-14-3Mon, 16 Dec 2013 19:50:24 +0000Answered: What is length of rope on flagpole if adjacent side is 11.6 meters long and opposite angle is 36.8 degrees?
http://www.explainplease.com/88377/length-rope-flagpole-adjacent-meters-opposite-angle-degrees?show=88678#a88678
Let "x" be the length of the adjacent and "y" the length of the opposite. The flagpole height will be the opposite.<br />
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tan θ = y / x → y = xtan θ<br />
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11.6 tan 36.8° = 8.68 meters<br />
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The rope must be twice the length of the pole to raise and lower the flag.<br />
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2 x 8.68 = 17.36 metersTrigonometryhttp://www.explainplease.com/88377/length-rope-flagpole-adjacent-meters-opposite-angle-degrees?show=88678#a88678Mon, 18 Nov 2013 23:22:51 +0000Answered: sine will have its maxium value at what degrees?
http://www.explainplease.com/76436/sine-will-have-its-maxium-value-at-what-degrees?show=77130#a77130
The positive peak of a sine wave centered at y = 0 occurs at 90 degrees. The negative peak occurs at 270 degrees.Trigonometryhttp://www.explainplease.com/76436/sine-will-have-its-maxium-value-at-what-degrees?show=77130#a77130Sat, 19 Oct 2013 05:26:42 +0000Answered: If 5tanA =4 then find the value of 5sinA+3cosA/sinA-2cosA
http://www.explainplease.com/69424/if-5tana-4-then-find-the-value-of-5sina-3cosa-sina-2cosa?show=69589#a69589
There is more than one way to solve this. One way is to use trig identities.I will use the following method.<br />
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sinA = opposite / hypotenuse<br />
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cosA = adjacent / hypotenuse<br />
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tanA = opposite / adjacent<br />
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If 5tanA = 4 then tanA = 4/5.<br />
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This describes a triangle where the opposite is length 4 and the adjacent is length 5.<br />
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Let "a" be the opposite, "b" the adjacent and "c" is the hypotenuse.<br />
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a = 4<br />
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b = 5<br />
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From this, derive:<br />
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sinA = 4/c<br />
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cosA = 5/c<br />
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Use these values to rewrite the equation<br />
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[5sinA + 3cosA] / [sinA - 2cosA]<br />
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[5(4/c) + 3(5/c)] / [(4/c - 2(5/c)]<br />
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[20/c + 15/c] / [(4/c - 10/c)]<br />
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[35/c] / [-6/c]<br />
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Eliminate "c" by multiplying this equation by c/c which is the same as multiplying by 1.<br />
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-35/6Trigonometryhttp://www.explainplease.com/69424/if-5tana-4-then-find-the-value-of-5sina-3cosa-sina-2cosa?show=69589#a69589Wed, 02 Oct 2013 00:04:01 +0000Answered: What is a unit circle?
http://www.explainplease.com/19021/what-is-a-unit-circle?show=27613#a27613
The unit circle is a circle with a radius of one. Frequently, especially in trigonometry, the unit circle is a circle of radius one centered.Trigonometryhttp://www.explainplease.com/19021/what-is-a-unit-circle?show=27613#a27613Thu, 09 May 2013 04:02:45 +0000