Question

simplify (cos u + sin u)2

Answer 1

First of all apply this identity:

\[\large{(a+b)^2 = a^2 + b^2 + 2ab}\]

Here, a = cos u and b = sin u

Answer 2

Can you do this part ?

Answer 3

Now, you will also need this identity:

\[\large{\sin^2{\theta} + \cos^2{\theta} = 1}\]

Answer 4

Can you solve it now @mlgossett ?