Prove that
To Prove: cot - tan = 2cot x
Proof: Consider L.H.S,
cot - tan -
=
= ()
Here multiply and divide L.H.S by 2
= (2sinxcosx = sin2x)
()
cot - tan = 2cotx = R.H.S
L.H.S = R.H.S, Hence proved