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Revision: Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios] Mathematics (English Medium) ICSE Class 9 CISCE

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Key Points

Key Points: Trigonometric Ratios of Specific Angles
Angle 30° 45° 60° 90°
sin 0 1/2 1/√2 √3/2 1
cos 1 √3/2 1/√2 1/2 0
tan 0 1/√3 1 √3 Not defined
cosec Not defined 2 √2 2/√3 1
sec 1 2/√3 √2 2 Not defined
cot Not defined √3 1 1/√3 0
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