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use the figure to find the exact value of the trigonometric function.

0 votes

cos 2θ

trigonometric-multiple-angle-functions-

asked Jan 22, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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Step 1:

Observe the figure adjacent side is 4 and opposite side is 1.

From the Pythagorean theorem,

From basic trigonometric ratio's .

Step 2:

Find the value of .

Apply the double angle formula .

.

Solution:

.

answered Jan 22, 2015 by david Expert

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