Question

use even and odd properties of trig functions to find the exact value of the expression, cos(-60)
posted 30 mins ago,no help

Answer 1

let f(x) be a function
so f(x) will be even when\[\boxed {f(-x)=f(x)}\]and f(x) will be odd when\[\boxed{f(-x)=-f(x)}\]

Answer 2

now cos(x) is a even function
so by this property we can write\[\cos(-x)=\cos(x)\]
ok?
make sense

Answer 3

finally we can write\[\cos(-60)=\cos(60)=\frac{ 1 }{ 2 }\]
got it? @dabeezy