evulate cos square 0degree +cos square1degree+cos square2degree+cossquare3degree+.....+cos square88degree+cos square89degree
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cos²0° + cos²1° + cos²2° +..........+ cos² 88° + cos²89°
= cos²0° + cos²1° + ......cos²44° + cos²45° + sin²(90°-46) +.........+ sin²(90°-1°)
= 1 + cos²1° + sin²1°+.......cos²44° + sin²44° + cos²45°
= 1+44+1/2
=45+1/2
= 91/2
# hope it can help you##
= cos²0° + cos²1° + ......cos²44° + cos²45° + sin²(90°-46) +.........+ sin²(90°-1°)
= 1 + cos²1° + sin²1°+.......cos²44° + sin²44° + cos²45°
= 1+44+1/2
=45+1/2
= 91/2
# hope it can help you##
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