1. Evaluate: Sin2 5° + Sin2 10° + Sin2 80°+ Sin2 85°
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answer is 19/2.
Take pairwise for eq (sin^2 5+sin^2 85)
Use the identity sin(90-x)=cosx
further proceed by using sin^2 x+ cos^2 x=1.
All the best for future.
Take pairwise for eq (sin^2 5+sin^2 85)
Use the identity sin(90-x)=cosx
further proceed by using sin^2 x+ cos^2 x=1.
All the best for future.
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