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按你写的,是f(x)=(3x³-2x+1)sinx²
f'(x)=(3x³-2x+1)'·sinx²+(3x³-2x+1)·(sinx²)'
=(9x²-2)·sinx²+(3x³-2x+1)·cosx²·(x²)'
=(9x²-2)·sinx²+2x·(3x³-2x+1)·cosx²
如果你想写的是:f(x)=(3x³-2x+1)sin²x,那么:
f'(x)=(3x³-2x+1)'·sin²x+(3x³-2x+1)·(sin²x)'
=(9x²-2)·sin²x+(3x³-2x+1)·2sinx·(sinx)'
=(9x²-2)·sin²x+(3x³-2x+1)·2sinxcosx
=(9x²-2)·sin²x+(3x³-2x+1)·sin(2x)
f'(x)=(3x³-2x+1)'·sinx²+(3x³-2x+1)·(sinx²)'
=(9x²-2)·sinx²+(3x³-2x+1)·cosx²·(x²)'
=(9x²-2)·sinx²+2x·(3x³-2x+1)·cosx²
如果你想写的是:f(x)=(3x³-2x+1)sin²x,那么:
f'(x)=(3x³-2x+1)'·sin²x+(3x³-2x+1)·(sin²x)'
=(9x²-2)·sin²x+(3x³-2x+1)·2sinx·(sinx)'
=(9x²-2)·sin²x+(3x³-2x+1)·2sinxcosx
=(9x²-2)·sin²x+(3x³-2x+1)·sin(2x)
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