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In this lesson, we will learn how to use the Pythagorean identity and double-angle formulas to evaluate trigonometric values.
Q1:
Find the value of c o s 2 π΄ given c o s π΄ = β 3 5 where 9 0 < π΄ < 1 8 0 β β without using a calculator.
Q2:
Find the value of c o s ο½ π 2 ο given c o s π = 1 5 1 7 where 0 < π < 9 0 β β without using a calculator.
Q3:
Find the value of c o s οΌ π΄ 2 ο given s i n οΌ π΄ 2 ο = 3 5 without using a calculator.
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