Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\int_{0}^{\pi/2}\cos^{4}xdx$$

Evaluate

$\frac{3\pi }{16}\approx 0.589048623$

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