Answer:
sin θ + cos θ
Explanation:
There is a trigonometric identity that states that:
sin²θ + cos²θ = 1
Now, for the given we have:
(sin²θ + cos²θ) (sin θ + cos θ)
Applying the above identity, we would find that the expression becomes:
(1) (sin θ + cos θ) which is equal to sin θ + cos θ
Hope this helps :)