If the sum of two angles is then, it is called Complementary Angles. In a right-angled triangle, one angle is
, so the sum of the other two angles is also
or they are complementary angles.so the trigonometric ratios of the complementary angles will be –
Sin = cos A,
cos = sin A,
Tan = cot A,
Cot = tan A,
Sec = cosec A,
Cosec = sec A