若sin^2 40度+sin^2 a=1,且a为锐角,则a=?
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1-sin a+sin a的平方-sin a的立方+……若a是正锐角,且sin a-cos a=0.5,求1-sin a+sin^2a-sin^3a+……
若sin^2 40度+sin^2 a=1,且a为锐角,则a=?
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懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+ab/2)sin[(n+1)b/2]/sin(b/2)
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