sin(θ-π/4)+cos(θ+π/4) 化简
化简sin(θ-π/4)+cos(θ+π/4)
cos^4θ-sin^4θ化简
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
化简sin(θ-5π)cos(π/2+θ)cos(4π-θ)/cos(3π-θ)sin(θ-3π)sin(-θ-4π)
化简[cot(θ+4π)cos(θ+π)sin²(θ+3π)]/[tan(π+θ)cos²(-π-θ
已知tan(θ+π/4)=-2,求cosθ平方+sinθcosθ-1
2(sinθ+cosθ)= 2√2sin(θ+π/4)为什么?; (-π/2
sin(θ-5π)cos[(-π/2)-θ]cos(8π-θ)}/sin[θ-(3π/2)]sin(-θ-4π)
θ∈(0,π/2),比较cosθ、sin(cosθ)、cos(sinθ)的大小
化简:cot(θ+4π)•cos(θ+π)•sin
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos
若2sin(π4+α)=sin θ+cos θ,2sin2β=sin 2θ,求证:sin&