Question

Help please trigonometric identities

Answer 1

cot=cos/sin

so, it becomes sin^2+cos^2=1

that proves it

Answer 2

Sin^2x ( 1 + cot^2x) = 1
Change cot^2x to cos/sin
Sin^2x(1+cos^2x/sin^2x))=1
Distribute the sin^2x
Sin^2x + cos^2x = 1
1 = 1