Question

Solve for L. L=110+25 cos(4pi)

Answer 1

do you know the value of

\[\cos(4\pi)\]

Answer 2

it might help to know that cosine repeats its values every 2π radians (360° degrees)

so \(\cos(\theta)=\cos(\theta+2\pi)=\cos(\theta+4\pi)=\dots=\cos(\theta+2n\pi)\)

where \(n\) is an integer: \(n\in\mathbb Z\)

Answer 3

so,\[\cos(4\pi)=\cos(2\pi)=\cos(0\pi)=\cos(0)\]

do you know the value of the cosine of zero?