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    				| 1. | Integrate the following with respect to ‘x’:(i) 1/sin2 x (ii) tan x/cos x(iii) cos x/sin2 x (iv) 1/cos2 x | 
| Answer» (i) ∫1/sin2 x dx = ∫cosec2 x dx = -cot x + c (ii) ∫tan x/cos x dx = ∫sec x tan x dx = sec x + c (iii) ∫cos x/sin2 x dx = ∫cosec x cot x dx = - cosec x + c (iv) ∫1/cos2 x dx = ∫sec2 x dx = tan x + c | |