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April 28, 2015

Homework Help: Math

Posted by mysterychicken on Monday, June 3, 2013 at 4:29pm.

1. Find the exact value of 2tan pi/12 / 1-tan^2 pi/12
root 3/3?

2. Given tanθ = -1/3 and with θ in quadrant IV, find the exact value of cos2(θ)
4/5

3. Exact value of cos^2 67.5 - sin^2 67.5
root3 /2

4. The expression cos 3θ can be rewritten as 1 - 4cosθ + 4cos^3θ
False

5. The expression sin 3θ can be rewritten as 3sinθ - 4sin^3 θ
Not sure

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