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How to calculate trigonometric functions without a calculator and without drawing anything - Quora
Symbolab Blog: High School Math Solutions – Trigonometry Calculator, Trig Identities
SOLVED: Given the trigonometric function values of 30°, 45°, and 60° as shown, without using a calculator, use trigonometric identities/formulas to prove which one of these four is the exact value of
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How to evaluate trigonometric functions with a calculator - Quora
Trigonometric Identities and Conditional Equations