Pure Maths EQ - Solving a Trigonometric Equation using Trigonometric Identities

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In this video I cover an exam question on using a trigonometric identity to solve a trigonometric equation.

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sir for your final solutions, why don't you do pi - pi/3 because it gives you 2/3 pi which is still in the range

safiyak
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At 4:53 how is 1 divided by root3/3 = root3

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