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Solve : (dy/dx) - y tan x = - y sec2 x

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(dy/dx) - y.tan x = - y sec2 x

(dy/dx) + y sec2x - y tan x = 0

(dy/dx) + (sec2x - tan x)y = 0

(dy/dx) = -(sec2 x - tan x)y

(dy/y) = (tan x - sec2 x)dx

Integrating both sides,

∫dy/dx = ∫(tan x - sec2 x) dx

log y = log|sec x| - tan x + c

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