What is cos(n*pi-pi) ?

The solution to cos(n*pi-pi) is -(-1)^n

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

simplify cos(n*pi-pi)

simplify

cos (n \cdot π - π)

- (- 1)^{n}

Solution steps

cos (nπ - π)

Rewrite using trig identities

= - cos (πn)

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= - (- 1)^{n}

cot (9 0^{\circ} + a)

cos (- Nt)

sin (arccos (w))

cos (\frac{π}{2} - z)

3 cos^{3} (\frac{x}{5} - π)