如何求y= sint在[-π/2,π]上的导数?
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(1/2)[arcsiny+y/√(1-y²)]+C
解析:
设y=sint,t∈[-π/2,π/2]
则,
∫√(1-y²)dy
=∫costd(sint)
=∫cos²tdt
=∫(1+cos2t)/2dt
=(1/4)∫(2+2cos2t)dt
=(1/4)(2t+sin2t)+C
=(1/4)(2arcsiny+2sintcost)+C
=(1/4)(2arcsiny+2y/√(1-y²)]+C
=(1/2)[arcsiny+y/√(1-y²)]+C
解析:
设y=sint,t∈[-π/2,π/2]
则,
∫√(1-y²)dy
=∫costd(sint)
=∫cos²tdt
=∫(1+cos2t)/2dt
=(1/4)∫(2+2cos2t)dt
=(1/4)(2t+sin2t)+C
=(1/4)(2arcsiny+2sintcost)+C
=(1/4)(2arcsiny+2y/√(1-y²)]+C
=(1/2)[arcsiny+y/√(1-y²)]+C
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