高中数学,第13题怎么写,求解答
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设角MO为a M=Rsina OP=NP=M=Rsina O=Rcosa P=R(cosa-sina) PM^2=M^2+P^2 =R^2(sina^2-2sinacosa+1) =R^2[(1-cos2a)/2-sin2a+1] =R^2[3/2-(sin2a+cos2a/2)] =R^2[3/2-srt(5)/2sin(2a+b)] >=[3/2-srt(5)/2]R^2 S=M*P =R^2(sinacosa-sin
高中数学
设角MO为a M=Rsina OP=NP=M=Rsina O=Rcosa P=R(cosa-sina) PM^2=M^2+P^2 =R^2(sina^2-2sinacosa+1) =R^2[(1-cos2a)/2-sin2a+1] =R^2[3/2-(sin2a+cos2a/2)] =R^2[3/2-srt(5)/2sin(2a+b)] >=[3/2-srt(5)/2]R^2 S=M*P =R^2(sinacosa-sin
高中数学
设角MO为a M=Rsina OP=NP=M=Rsina O=Rcosa P=R(cosa-sina) PM^2=M^2+P^2 =R^2(sina^2-2sinacosa+1) =R^2[(1-cos2a)/2-sin2a+1] =R^2[3/2-(sin2a+cos2a/2)] =R^2[3/2-srt(5)/2sin(2a+b)] >=[3/2-srt(5)/2]R^2 S=M*P =R^2(sinacosa-sin
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