Evaluate without using tables: (cos47/sin 43)^2 + (sin 72/cos 18)^2 -2 cos^2 45.
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Answer:
sin(43)=sin(90-47)= cos47
cos(18)= cos(90-72) = sin72
cos45 = 1/sqrt 2
= (1)^2 +(1)^2 -1
=1
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