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Popular >

simplify cos(npi-1)

Solution

simplify

cos (nπ - 1)

Solution

cos (1) (- 1)^{n}

Solution steps

cos (nπ - 1)

Use the basic trigonometric identity:

cos (x + nπ) = (- 1)^{n} cos (x)

= (- 1)^{n} cos (- 1)

Simplify

cos (- 1) : cos (1)

= cos (1) (- 1)^{n}

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Frequently Asked Questions (FAQ)

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