Answer:
8
Step-by-step explanation:
Answer:

Step-by-step explanation:
We know by definition that the cosine is an even function, therefore

We also know that the sin is an odd function, therefore

By definition:

Then:


Using these trigonometric properties we can simplify the expression

Answer:
1: x
=
10
−

y
=
20
−
2
x
2: x
=

y
=

Step-by-step explanation: