What is cos(pi+pi/4 n) ?

The solution to cos(pi+pi/4 n) is -cos((pin)/4)

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simplify cos(pi+pi/4 n)

simplify

cos (π + \frac{π}{4} n)

- cos (\frac{πn}{4})

Solution steps

cos (π + \frac{π}{4} n)

Rewrite using trig identities

= - cos (\frac{πn}{4})

\frac{x e ^{- x}}{sin ( x )}

2 sin (\frac{2 x}{3} - 3 π) + 2

r (\frac{1}{cos ^{2} ( x )})

[e^{- t} cos (3 t - 6 0^{\circ})]

4 (1 + sin (π - x))