sine ouput from opamp

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my ques is dat i am giving x as input...
and i have to make dis circuit using opamps
i read sumwhere dat quadrature oscilator can give such output.
so plz xplain and if their is anyother way then do tell me
 
A simple way to get a quasi sine-wave at a fixed frequency is to integrate a triangle wave (or double integrate a square-wave). The result is a reasonably good sinewave signal with the third harmonic about 29dB down and total harmonic distortion of <5%. Here's a display of that integration. The voltage output of the integrators vary with frequency, of course.
 
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