Find the distance between the points (a cos$, a sin$) and
(-a sin$, a cos$).
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Using distance formula
D=√(-asin$-acos$)^2+(acos$-asin$)^2
=√2a^2
=a√2
D=√(-asin$-acos$)^2+(acos$-asin$)^2
=√2a^2
=a√2
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