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

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cos (θ/2)

trigonometric-multiple-angle-functions-

asked Jan 22, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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Step 1 :

Find the exact value of .

From the figure, opposite side is and adjacent side is .

Pythagorean theorem : .

Step 2 :

The trigonometric function : .

Find by using half-angle formula.

Half-angle formula : .

The exact value of is .

Solution :

The exact value of is .

answered Jan 22, 2015 by lilly Expert

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