Fourier coefficients of sine waveform

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$$v(t)=0\space if \space -T/2\le t<0$$ $$\space sin(\omega_0t)\space if\space0 \le t<T/2$$

$$\omega_0=\frac{2\pi}{T}$$ Given the above waveform i need to find the fourier coefficients $a_0,a_n,b_n.$ Can I get help on how to start solving this?