化简sin(-11π/3)+cos(12π/5)tan2π-sec13π/5cot(-5π/2)

化简sin(-11π/3)+cos(12π/5)tan2π-sec13π/5cot(-5π/2) 3sinπ+5cosπ╱2+7tan2π 化简cos(α-π)cot(5π-α)/tan(2π-α)sin(-2π-α) 已知sinα=3/5,α∈(π/2,π)求sin(α-π/4).cos(α+π/3)及tan2π的值 化简sin(θ-5π)•cot(π2-θ)•cos(8π-θ)tan(3π-θ)•tan(θ-32π)•sin(-θ-4 化简[sin(π-α)tan(5π/2+α)]/[cos(2π-α)cot(π/2-α)] cos(α-3π/2)=1/5,求sinα*cotα α是第三象限角. 1.化简f(a)={[sin(π-α)cos(2π-α)cot(3π+α)]/[cot(-π-α)sin(-π-α)]} sin(θ -5π)/tan(3π-θ)*cot(π/2-θ)/tan(θ -3/2π)*cos(8π-θ)/sin(- sin(a-5π)/tan(3π-a)*cot(π/2-a)/tan(a-3π/2)*cos(8π-a)/sin(-a- 化简 (sin^2(a+π)cos(2π-a)cot(a-2π))/(tan(π-a)cos^3(-a-π)) 化简sin^2(α+π)cos(π+α)cot(-α+2π)/tan(π-α)cos^3(-α-π)