Question

∫dx/(1 + cos x) for x ∈ [π/4,3π/4] is equal to 

(a) 2 

(b) –2 

(c) 1/2 

(d) –1/2

Answer 1

Correct option is (a) 2

Let

Adding Eqs (i) and (ii), we get

= –2(–1 – 1) 

= 4 

I = 2