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Question
Answer the following:
Find the trigonometric functions of :
90°
Sum
Solution
Angle of measure 90° :
Let m∠XOA = 90°
Its terminal arm (ray OA) intersects the standard unit circle at P(0, 1).
∴ x = 0 and y = 1
sin 90° = y = 1
cos 90° = x = 0
tan 90° = `y/x = 1/0`, which is not defined
cosec 90° = `1/y = 1/1` = 1
sec 90° = `1/x = 1/0`, which is not defined
cot 90° = `x/y = 0/1` = 0
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Trigonometric Functions with the Help of a Circle
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Chapter 2: Trigonometry - 1 - MISCELLANEOUS EXERCISE - 2 [Page 33]
