(求步骤)化简:[sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]

问题描述:

(求步骤)化简:[sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]

[sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]
=[cosa(-sina)(-tan2a)]/[sina(-cosa)]
=-tan2a