अगर x = acose, y= b sine तो
dy
का मान निम्न में से क्या है ?
dx
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x = acostheta; y = bsintheta costheta = xa; sintheta = yb cos^2theta + sin^2theta = 1 = x^2a^2 + y^2b^2 x^2b^2 + a^2y^2 = a^2b^2 . More
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