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Integral Calculus> integrate the following integral ∫ cos 3x...

question mark

integrate the following integral
∫ cos 3x cos 4x dx

taniska , 11 Years ago

Grade 12

1 Answers

Jitender Singh

Ans:
Hello Student,
Please find answer to your question below

$I = \int cos3xcos4xdx$
$I = \frac{1}{2}\int 2cos3xcos4xdx$
$I = \frac{1}{2}\int [cosx+cos7x]dx$
$I = \frac{1}{2}[\int cosxdx+\int cos7xdx]$
$I = \frac{1}{2}[sinx+\int cos7xdx]$
$I = \frac{1}{2}[sinx+\frac{sin7x}{7}]+c$

Last Activity: 11 Years ago

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