54 经济数導數等於它們導數的代數和. ... 解 y′ = (tanx)′= ′ = (sinx)′cosx cos2x - sinx(cosx)′ = ⎛│⎝cosxsinx⎞│⎠ cos2x cos2x + sin2x = cos2x 1 = sec2x 即: ...
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