What is (cos(npi))/(n^2) ?

The solution to (cos(npi))/(n^2) is ((-1)^n)/(n^2)

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simplify (cos(npi))/(n^2)

simplify

\frac{cos ( nπ )}{n ^{2}}

\frac{( - 1 ) ^{n}}{n ^{2}}

Solution steps

\frac{cos ( nπ )}{n ^{2}}

Use the basic trigonometric identity:

cos (nπ) = (- 1)^{n}

= \frac{( - 1 ) ^{n}}{n ^{2}}

\frac{d x}{sec ^{2} ( x )}

cos (sin (- 1 (x)))

sin (t + 2 π)

tan (π - a)

csc (\frac{3 π}{2} - x)