want help in rewrite expression sqrt(81-x^(2))/x x=9 sin theta

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llltkl | College Teacher | (Level 3) Valedictorian

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Given `x=9sintheta`

To rewrite the expression `sqrt(81-x^(2))/x` plug in the value of x.



`= sqrt((81(1-sin^2theta))/(9sintheta))`

`= sqrt((81*cos^2theta)/(9sintheta))`    `(sin^2theta=1-cos^2theta)`


This is the required expression.


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