Matlab: Error using sin (squared)

Question

theta = (0:0.01:2*pi)

r = sin.^2.*(theta) + cos.^2.*(theta)

it returns me this error;

Error using sin. Not enough input arguments.

I am confused, what do i need to change?

Answer 1

r = (sin(theta)).^2 + (cos(theta)).^2

Answer 2

I think sine squared can be done with either:

sin(x).*sin(x)

or

sin(x).^2