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In this lesson, we will learn how to use function values of special angles to evaluate trigonometric expressions.
Q1:
The intensity of an electric current is given by 𝐶 = 1 5 2 ( 7 5 𝑡 ) c o s where 𝑡 is the time in seconds. Rewrite the intensity after one second using sum and product formulae in terms of special angles.
Q2:
Find the value of c o s − 𝜋 4 .
Q3:
Find the value of s i n 5 𝜋 3 .
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