What is expand cos((3+n)pi) ?

The solution to expand cos((3+n)pi) is -(-1)^n

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expand cos((3+n)pi)

expand

cos ((3 + n) π)

- (- 1)^{n}

Solution steps

cos ((3 + n) π)

Expand

(3 + n) π : 3 π + πn

= cos (3 π + πn)

Rewrite using trig identities

= - cos (πn)

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= - (- 1)^{n}

2 x^{5} - 4 x^{2} + 6 x (x^{2} - x)^{2}

3 (2 + 7)

(x - 5) (x + 5)

\frac{( 4 - x ^{2} ) ^{3}}{3}

(2, 14) y (- 1, - 7)