Answer:
sin s = -
Explanation:
Given
tan s = =
Then this is a 5- 12- 13 right triangle with hypotenuse = 13
Since tan s > 0 and cos s < 0
Then s is in the third quadrant where sin s < 0
sin s = = -
- 5/13
tans = 5/12 = height/base
Using Pythagoras, hypotenuse = √12² + 5² = 13
Therefore coss had to be 12/13
But since cos s < 0, cos s = - 12/13
Thus,
tanA = sinA/cosA
tanA cosA = sinA
(5/12)(- 12/13) = sinA
- 5/13 = sinA
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