How to check the signs of trigonometric functions for different angles?
2015-08-29 3 Dailymotion
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