sin2x+4cos2x=1+3cos2xsin^2x+4cos^2x=1+3cos^2xsin2x+4cos2x=1+3cos2x
(−4)(−3)(1)(−2)\left(-4\right)\left(-3\right)\left(1\right)\left(-2\right)(−4)(−3)(1)(−2)
9x2−4x+49x^2-4x+49x2−4x+4
25+(−20)x(−30):225+\left(-20\right)x\left(-30\right):225+(−20)x(−30):2
(7x3)2(x8)12\left(7x^3\right)^2\left(x^8\right)^{\frac{1}{2}}(7x3)2(x8)21
2+3⋅(5−2)2+3\cdot\left(5-2\right)2+3⋅(5−2)
(x−9)=x2−81\left(x-9\right)=x^2-81(x−9)=x2−81
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