f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题,

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f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题,

f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题,
f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)
还有一题,

f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)还有一题,
f(x)=(1+cotx)sin^2x-2sin(x+π/4)sin(x-π/4)=(sinx+cosx)sinx+cos((x+π/4)+(x-π/4))-cos((x+π/4)-(x-π/4))
=(sinx+cosx)sinx+cos2x
=sin^2x+1/2sin2x+cos2x
=(1-cos2x)/2+1/2sin2x+cos2x
=1/2sin2x+1/2cos2x+1/2
=√2/2sin(2x+π/4)+1/2
化到这里什么都好办了
刚才那道完整版答慢了一步

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