1.

1+sectheta-tantheta/1+sectheta+tantheta=1-sintheta/costheta​

Answer»

\frac{1 + sec \theta - tan \theta}{1 + sec \theta + tan \theta} \\ \\ = \frac{( {sec}^{2} \theta - {tan}^{2} \theta) + (sec \theta - tan \theta)}{1 + sec \theta + tan \theta} \\ \\ = \frac{(sec \theta - tan \theta)(sec \theta + tan \theta + 1)}{1 + sec \theta + tan \theta} \\ \\ = sec \theta - tan \theta \\ \\ = \frac{1 - sin \theta}{cos \theta}


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