Find ∫ cos x / [(2 + sin x)(4 + sin x)] dx integration by substitution and partial fraction

Find ∫ cos x / [(2 + sin x)(4 + sin x)] dx integration by substitution and partial fraction integration integral calculus cbse 12th maths old board exam question paper 2025 2026 integration question #cbsemaths #cbse #maths #ncertmaths #mathematics #math #cbse12thmaths #isc #partialfractions #integration