Answer:
Taking LHS,
= cot x – 2cot 2x …(i)
We know that,
cot x = cos x/ sin x
Replacing x by 2x, we get
cot 2x = cos 2x/ sin 2x
So, eq. (i) becomes
= sin x/ cos x
= tan x
= RHS
∴ LHS = RHS
Hence Proved
Answer:
Taking LHS,
= cot x – 2cot 2x …(i)
We know that,
cot x = cos x/ sin x
Replacing x by 2x, we get
cot 2x = cos 2x/ sin 2x
So, eq. (i) becomes
= sin x/ cos x
= tan x
= RHS
∴ LHS = RHS
Hence Proved