11kahan se kahan tak ?????????/
kuch option to de do
11 Answers
13this is the complete question.....all solutions..no options given...have to show the steps.....
11abhi bhai cosx mein cubic ban jaaegi
meand it should have 3 roots
x=0
x=pi/2
x=?????
bas aakhri waala reh gaya
cubic cosx mein aaegi
just write sin5x as sin2x X sin3x
then use sin2x=1-cos2x
9sinx be s
cosx be c
s2 + c2 =1
now as s,c≤1
with higher powers obvious either s or c =1
