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