1.

Find the integral of 2 sin⁡2x+3.(a) sin⁡2x+3x+C(b) -cos⁡2x-3x^3+C(c) -cos⁡2x+3x+C(d) cos⁡2x-3x+12+CI got this question by my school teacher while I was bunking the class.This intriguing question comes from Integration as an Inverse Process of Differentiation topic in portion Integrals of Mathematics – Class 12

Answer»

Right CHOICE is (c) -cos⁡2x+3x+C

Best EXPLANATION: To find ∫ 2 sin⁡2x+3 DX

\(\int \,2 \,sin⁡2x+3 \,dx=\int \,2 \,sin⁡2x \,dx + \int \,3 \,dx\)

\(\int \,2 \,sin⁡2x+3 \,dx=2\int \,sin⁡2x \,dx+3\int \,dx\)

\(\int \,2 \,sin⁡2x+3 \,dx=\frac{-2 cos⁡2x}{2}+3x\)

∴∫2 sin⁡2x+3 dx=-cos⁡2x+3x+C



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