In the triangle below, calculate the cot θ.

Here , you can use any way to find theta
So, Sin theta=opposite side/ hypotenuse side
=>Sin theta=4/5
Now ,if Sin theta=0.8,then sin(theta+2pi)=sin (theta +4 pi)
=Sin Theta=0.8,then Sin+sin(theta+2 pi)+sin(theta+4 pi)=3sin theta=2.4
=>theta=2.4