In mathematics, sine and cosine are trigonometric functions of an angle. The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle, and the cosine is the ratio of the length of the adjacent leg to that of the hypotenuse. For an angle , the sine and cosine functions are denoted as and .

गणित में ज्या (Sine), एक त्रिकोणमितीय फलन का नाम है। समकोण त्रिभुज में समकोण के अलावा एक कोण x है तो,

ज्या (x) = कोण x के सामने की भुजा की माप / कर्ण की माप