Q30 of 35 Page 3

Prove that =2sinx


L.H.S =
       =
       =
[Using the identity cos2x = cos2x – sin2x and sinx – siny = 2cos sin ]
       =
       = 2sinx
       = R.H.S

More from this chapter

All 35 →
28
Prove that = tan

29

31
Prove that  

32
cot x cot 2x – cot 2x cot3x – cot3x cotx =1