The angles which are often used in trigonometry are 0, 30, 45, 60 and 90 degrees. So, we should know the values of different trigonometric ratios for these angles. There is a proper method to memorize all of them.
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Solved: Look at the table below and analyze. rat ned ned The table
Values of Trigonometric ratios for 0, 30,45, 60 and 90 degrees
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Exact Values of Trigonometric Functions of Widely Used Angles