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Ratio for Acute Angles

Ratio for General Angles

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Ratio for Negative Angles

Ratio for Special Angles

Ratio for Complementary Angles

Other Trigonometry Ratios

Inverse Functions

Quiz 

Trigonometry Main Page

Quiz 

Angles & Ratios

Evaluate sin (2 sin^-1 5/13)

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Given that tan A = 2 and cos B= -4/5, and that A and B are in the same quadrant, calculate, without calculators,

(i) sin (A - B)

(ii) cos B/2

Answers