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Find equation of tangent of curve y = cos (x + y), x ∈ [- 2π, 2π] which is parallel to the line x + 2y = 0

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Find equation of tangent of curve y = cos (x + y), x ∈ [- 2π, 2π] which is parallel to the line x + 2y = 0

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parallel to line x + 2y = 0 equation of tangent,

Hence, equation (i) and (ii) are the required equations of tangents.

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