The trigonometric ratios of some special angles, i.e., 0°, 30°, 45°, 60° and 90° follow a pattern and are easy to remember. Identifying and remembering this pattern helps in solving problems involving these angles.

Two angles are said to be complementary if their sum is 90°. Thus θ and (90° – θ) are complementary angles. Trigonometric ratios of complementary angles help in simplifying problems. Representing complementary angles in terms of these standard angles helps in solving a complex problem involving trigonometric ratios
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