4sin(θ/4)cosθcos(2θ)如何化简

4sin(θ/4 cos(θ/4 cosθcos(2θ /cos(θ/4 =2sin(θ/2 cosθcos(2θ /cos(θ/4 =2sin(θ/2 cos(θ/2 cosθcos(2θ /[co...

牵着乌龟去散步 2025-09-21 3 #cos #如何 #4sin