How to check the signs of trigonometric functions for different angles?

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Lesson#7
How to check the signs of trigonometric functions for different angles?
Math.Ex.9.2, Part7(9.2),
(i)cos 70° >0
(ii)co 170°
Chapter No. 9
Fundamentals of Trigonometry
Exercise No. 9.2
mathematics
part 1

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