Step-by-step explanation:
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
Answer:
15 pionts t
Step-by-step explanation:
thanks. .dssss
It is 42,44, and 46. If you add them all together you get 132 :)