帮我用计算机按出来对比 (π/2) +1 ,(3π/2) - 1 ,(π/4)+ cot(π/8) ,(7π/4)+co
1)求证cotαcosα/cotα-cosα=tan(α/2+π/4)
tan(-a+3/2π)/cot(-a-π)
tan(3/2π-α)=?;cot(-α-π)=?
cot(3π/2+A)为什么等于-tanA
tan(π-a)=1/3,cot(3π-2a)=?
y=-1/2cot(π/3-2x)的周期为?单调区间为?
tan(π/8)-cot(π/8)=?
1 2 3 4 5题 帮我填出来
证明tan(π/4+a)-cot(π/4+a)=2tan2a
证明 tan(π/4+α)-cot(π/4+α)=2tan2α
已知tanα+cotα=52,α∈(π4,π2)
tan(π/4-a)=cot(π/4+a)