C-08-Q105mediumsingle_mcqtanθ+secθ=x\tan\theta + \sec\theta = xtanθ+secθ=x হলে sinθ\sin\thetasinθ এর মান কত?ax2−1x2+1\dfrac{x^2-1}{x^2+1}x2+1x2−1bx2+1x2−1\dfrac{x^2+1}{x^2-1}x2−1x2+1c2xx2+1\dfrac{2x}{x^2+1}x2+12xd1−x21+x2\dfrac{1-x^2}{1+x^2}1+x21−x2