C-09-Q157mediumsingle_mcqsin90∘=?\sin 90^\circ = ?sin90∘=?a000b111c∞\infty∞dundefinedব্যাখ্যাAt 90∘90^\circ90∘ the side opposite the angle equals the hypotenuse, so the ratio sin90∘=1\sin 90^\circ=1sin90∘=1.