1. 1 + tan^2 θ = sec^2 θ 2. The principal solution of tan x = 1 is π/4 only.

Question

True/False

1. 1 + tan² θ = sec² θ

2. The principal solution of tan x = 1 is \(\frac{\pi}{4}\) only.

3. The value of cos x is increase in θ ∈ (0, π / 4).

4. The value of tan 15° = \(\frac{\sqrt3 - 1}{\sqrt3+1}.\)

5. The value of sin 18° = √5 - 1.

Answer 1

1. True

2. True

3. False

4. True

5. False