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

0 votes

cos 2θ

 

asked Jan 22, 2015 in TRIGONOMETRY by anonymous

1 Answer

0 votes

Step 1:

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

From the Pythagorean theorem,

  image

image

image

From basic trigonometric ratio's .

image

Step 2:

Find the value of image.

Apply the double angle formula image.

image

image

image.

Solution:

image.

answered Jan 22, 2015 by david Expert

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