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Mark the correct alternative in the following:

If and then the value of A + B is

put a=0

tan(A)=0

tan(B)=1

A+B=

The value of is

If A + B + C = π, then sec A (cos B cos C – sin B sin C) is equal to

tan 20^{o} + tan 40^{o} + √3 tan 20^{o} tan 40^{o} is equal to

If 3 sin x + 4 cos x = 5, then 4 sin x – 3 cos x =

If in a ∆ABC, tan A + tan B + tan C = 6, then cot A cot B cot C =

tan 3A – tan 2A – tan A is equal to

If then is equal to

If and where P and Q both are acute angles. Then, the value of P – Q is

If cot (α + β) = 0, then sin (α + 2 β) is equal to

is equal to

If then

If sin (π cos x) = cos (π sin x), then sin 2x =

If and then the value of θ + ϕ is

The value of cos (36^{o} – A) cos (36^{o} + A) + cos (54^{o} + A) cos (54^{o} – A) is

If tan (π/4 + x) + tan (π/4 – x) = a, then tan^{2} (π /4 + x) + tan^{2} (π /4 – x) =

If then the smallest positive value of B is

If A – B = π /4, then (1 + tan A) (1 – tanB) is equal to

The maximum value of is

If and tan A tan B = 2, then

If tan 69^{o} + tan 66^{o} – tan 69^{o} tan 66^{o} = 2k, then k =

If and then α + β is equal to