(−21)⋅(15)\left(-21\right)\cdot\left(15\right)(−21)⋅(15)
27x6−51227x^6-51227x6−512
cos4x=18cos4x+12cos2x+38cos^4x=\frac{1}{8}cos4x+\frac{1}{2}cos2x+\frac{3}{8}cos4x=81cos4x+21cos2x+83
−6=−4+cscθ -6=-4+csc\theta\:−6=−4+cscθ
12+5(−4)12+5\left(-4\right)12+5(−4)
17,456⋅5,617,456\cdot5,617,456⋅5,6
−42\sqrt[2]{-4}2−4
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