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Θ चे निरसन करा: जर x = r cosθ आणि y = r sinθ - Mathematics 2 - Geometry [गणित २ - भूमिती]

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Question

θ चे निरसन करा:

जर x = r cosθ आणि y = r sinθ

Sum

Solution

x = r cosθ

y = r sinθ

x2 = r2 cos2θ

∵ `x^2/r^2 = cos^2theta`     ...(1)

`y^2 = r^2sin^2theta`

`y^2/x^2 = sin^2theta`

`sin^2theta + cos^2theta = 1`

`y^2/r^2 + x^2/r^2 = 1`    ...[सूत्र]

∴ `(x^2 + y^2)/r^2 = 1`

∴ `x^2 + y^2 = r^2`

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