Answer:
25%, 1/3, .40, 3/5
Step-by-step explanation:
another way to look at this problem is, 25%, 33%, 40%, 60%
I think it is .40, 25% 1/3 3/5 but im slow so you might wanna check my work lol
L.H.S=(1-cosB)(1+cosB)
=(1-cos^2B). {using (a+b) (a-b)=(a^2-b^2)in second step}
=sin^2B
=1/cosec^2B
Therefore,L.H.S=R.H.S proved
