数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
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数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°
求详细解答过程!
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
sin(π/2-x)=cosx
原式=sin^2 1°+……+sin^2 44°+1/2+cos^2 44°+……+cos^2 1°
=44+1/2
=89/2