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ANSWER :- (b) r²
- x = r sin Q
- y = r cos Q
- x² =( r sin Q)²
- = r² sin² Q
- y² = (r cos Q)²
- = r²cos²Q
- x² + y² = r²sin²Q + r²cos²Q
- = r²(sin²Q + cos²Q)
- = r²
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