Evaluate sin^2 5degree+sin^2 10+.......+sin^85+cos^45
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As Sin^2 5° = Cos^2 85°
therefore,, Cos^2 5°+ Sin^2 5° = 1
Pairing of 5+85),,, (10+80) ,,15+75,,,,amd so on
As Sin^2 5° = Cos^2 85°
therefore,, Cos^2 5°+ Sin^2 5° = 1
Pairing of 5+85),,, (10+80) ,,15+75,,,,amd so on
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