How do you find the exact values of trigonometric functions for angles that aren't standard, like 75 degrees or 15 degrees?
Answer 1
Donald Hernandez
To find the exact values of trigonometric functions for non-standard angles like 75° or 15°, use angle sum and difference identities. For example, sin(75°) = sin(45° + 30°) = sin(45°)cos(30°) + cos(45°)sin(30°). Similarly, cos(75°) and tan(75°) can be calculated using the same identities.
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