Question
Fri February 13, 2009 By:

trignomentory

Expert Reply
Sat February 14, 2009

Note that 25 + 65=90

So,

 they are complementary angles.

So ,

 sin(25)=cos(65)

 and cos (25)=sin(65)

So,

 the expression becomes,

Sun March 26, 2017

solve

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