Remember this
In a trigonometric function we can find the following parts:
And to find the frequency we have the formula:
[tex]P=\frac{2\pi}{B}[/tex]Where P is the period and B is the frequency
So for 1.
a.4
b.
[tex]P=\frac{2\pi}{2}=\pi[/tex]c.pi
d.3
2.
a.2
b.
[tex]P=\frac{2\pi}{3}[/tex]c. -pi/2
d.-5
3.
a.
[tex]P=\frac{2\pi}{2\pi}=1[/tex]b.-4