1.

यदि (If) `x=a(theta+sintheta),y=a(1-costheta)`, (find) `(dy)/(dx)` निकालें ।

Answer» `x=a(theta+sintheta)therefore(dx)/(d theta)=a(1+costheta)` … (1)
तथा `y=a(1-cos theta)therefore(dy)/(d theta)=a(0+sin theta)=asin theta` … (2)
अब `(dy)/(dx)=(dy//d theta)/(dx// d theta)=(asintheta)/(a(1+cos theta))=(2"sin"(theta)/(2)"cos"(theta)/(2))/(2"cos"^(2)(theta)/(2))="tan"(theta)/(2)`


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