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CBSE - X
Trigonometric Ratios of Special Angles
We have already learnt that trigonometry is the study of relationships between the sides and angles of a triangle. The ratios of the sides in a right triangle with respect to its acute angles are called trigonometric ratios of the angle. The angles 
and 
are useful angles in trigonometry, and their numerical values are easy to remember.
When two angles add up to 900, then any one angle is the complement of the other. Trigonometric ratios of complementary angles help in simplifying problems.
