To prove: Taking LHS, Putting π = 180° = tan 2 60° + 2 cos 2 45° + 3 sec 2 30° + 4 cos 2 90° Now, we know that, Putting the values, we get = 3 + 1 + 4 = 8 = RHS ∴ LHS = RHS Hence Proved

Prove that

To prove:

Taking LHS,

Putting π = 180°

= tan² 60° + 2 cos² 45° + 3 sec² 30° + 4 cos² 90°

Now, we know that,

Putting the values, we get

= 3 + 1 + 4

= 8

= RHS

∴ LHS = RHS

Hence Proved