tan(-a+3π/2)
=tan(-a+2π-π/2)
=tan(-a-π/2)
=-tan(π/2+a)
=cota
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希望可以帮到你!
如对回答满意,
--------------------------------------------------------
tan(-a+3π/2)
=tan(-a+2π-π/2)
=tan(-a-π/2)
=-tan(π/2+a)
=cota
--------------------------------------------------------
希望可以帮到你!
如对回答满意,
--------------------------------------------------------