Nilai dari cos(−π2+3θ)=....\cos\left(-\frac{\pi}{2}+3\theta\right)=....cos(−2π+3θ)=....
sin3θ\sin3\thetasin3θ
−sin3θ-\sin3\theta−sin3θ
cos3θ\cos3\thetacos3θ
cos(−3θ)\cos\left(-3\theta\right)cos(−3θ)
−cos3θ-\cos3\theta−cos3θ