Answer:
Option (3)
Step-by-step explanation:
Correct steps for the proof are,
Step Statement
1 cos(2x) = 1 - 2sin²(x)
2 Let 2x = θ
3 x = 
4 
5 
6 
7 
8 
There is a mistake in step 6.
Therefore, Option (3) will be the answer.
Answer:
It is right
Step-by-step explanation:
Because the hypotenuse must be greater than all the legs, we have that
is the hypotenuse. So, we want to determine if
.

This means the triangle is indeed right!
Lateral Area of a cylinder is ; 2πR.H
R=12 mm and H= 15 mm
Then LATERAL area = 2π(12)(15) =48π ≈ 150 mm²