# Find the general solution of : cos x - sin x = 1. - Mathematics and Statistics

Sum

Find the general solution of : cos x - sin x = 1.

#### Solution

cos x - sin x = 1

Dividing by sqrt (1^2 + (-1)) = sqrt2

1/sqrt 2  "cos x" - 1/ sqrt 2  "sin x" = 1/ sqrt2

"cos"  pi/4 "cos  x" - "sin" pi/4 "sin  x" = 1/ sqrt2

"cos" ("x" + pi/4) = "cos" pi/4   ...(i)

The general solution of cos θ = cos α is θ = 2nπ ± pi/4 ; n ∈ z

∴ The genera; solution of equation (i) given by

"x" + pi/4 = 2"n"pi +- pi/4 ; n ∈ z

"x" = 2 n pi ; x = 2 n pi - pi/2 ; "n" ∈ z

Concept: Trigonometric Functions - General Solution of Trigonometric Equation of the Type
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