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
cos^2 18 degrees + cos^2 72 degrees.
Would I use the forumula
cos(pi/2 - Q) = sin Q
Answers
Answered by
Reiny
see previous post
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