Thread: Trigonometric Functions

10. and are acute angles in quadrant I, with sin =7/25 and cos=5/13. Without using a calculator determine the values of sin( + ) and tan( + ).

So far i did

x^2 + y^2 = r^2

x^2 + 7^2 = 25^2

x^2= 625-49
x= +- 24

im not sure if thats even right...

Originally Posted by Skoz

10. and are acute angles in quadrant I, with sin =7/25 and cos=5/13. Without using a calculator determine the values of sin( + ) and tan( + ).

So far i did

x^2 + y^2 = r^2

x^2 + 7^2 = 25^2

x^2= 625-49
x= +- 24

im not sure if thats even right...

looks ok so far 24 is the adj side angle
looks like you need to use the sum formulas

and