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Find a cofunction with the same value as the given expression.COS(3pi/7)

Sagot :

We will have the following:

[tex]\cos (\frac{3\pi}{7})=\sin (\frac{\pi}{2}-\frac{3\pi}{7})[/tex][tex]=\sin (\frac{\pi}{14})[/tex]

So, the cofunction with the same value as the expression gu

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