sin inverce(dy/dx) =X+y
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sin⁻¹(dy/dx) = x + y
==> (dy/dx) = sin(x + y) ---- (i)
Let x + y = u.
Differentiate with respect to x.
==> 1 + dy/dx = du/dx
==> dy/dx = du/dx - 1
Place the value of dy/dx in (i)
==> (du/dx) - 1 = sin u
==> (du/dx) = 1 + sinu
==> ∫(du/1+sinx) = ∫dx
==> ∫(1 - sinu/1 - sin²u) du = x + c
==> ∫(1 - sinu/cos²u) du = x + c
==> ∫(sec²u - secutanu) du = x + c
==> ∫sec²u - ∫tanusecu du = x + c
==> tanu - secu = x + c
- tan(x + y) - sec(x + y) = x + c
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