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Asked by Abby

1) Use the cofunction identites to evaluate the expression without the aid of a calculator.

cos^2 18 degrees + cos^2 72 degrees.

Would I use the forumula
cos(pi/2 - Q) = sin Q
15 years ago

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Answered by Reiny
see previous post
15 years ago
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1) Use the cofunction identites to evaluate the expression without the aid of a calculator.

cos^2 18 degrees + cos^2 72 degrees.

Would I use the forumula
cos(pi/2 - Q) = sin Q

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