Don't understand I speak English
It is multiplied by to because the raidouis is double.
I believe it is zero, because there is no number less than 1.

by using the integration formula
we get,

now put the value of t=\sin\theta in the above equation
we get,

hence proved
Answer:
y = 90 -5/2 x
Step-by-step explanation:
The angle on the left equals x+3x+x = 5x
The angle on the right equals 2y
The two angles are same side interior angles which are supplementary because the lines are parallel
5x+2y = 180
Solving for y
2y = 180-5x
Divide by 2
2y/2 = 180/2 -5x/2
y = 90 -5/2 x