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Popular >

simplify cos(pik)

Solution

simplify

cos (πk)

Solution

(- 1)^{k}

Solution steps

cos (πk)

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= (- 1)^{k}

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Frequently Asked Questions (FAQ)

What is cos(pik) ?
The solution to cos(pik) is (-1)^k