वक्रों के निदिर्ष्ट बिदुओ पर स्पर्श रेख ...

वक्रों के निदिर्ष्ट बिदुओ पर स्पर्श रेख और अभिलम्ब का समीकरण निकालें :
`11 x = a sin^3 t, y = b cos^2" t at t"=pi/2`

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