sin(π/4 +a)怎么化简,
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方程化简为:2sin( x+π4)=a即 sin( x+π4)=
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sin(x+π) sin(x+3/2π)怎么化简?
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cos平方(45°+a)-sin平方(45°+a)怎么化简
cos^2(4/π-a) 怎么等于 sin^2(4/π+a)
sin(π/4-A)-cos(π/4+A)怎么做