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Popular >

simplify cos(pin-pi)

Solution

simplify

cos (πn - π)

Solution

- (- 1)^{n}

Solution steps

cos (πn - π)

Rewrite using trig identities

= - cos (πn)

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= - (- 1)^{n}

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Frequently Asked Questions (FAQ)

What is cos(pin-pi) ?
The solution to cos(pin-pi) is -(-1)^n