: If tan A=- 9/13 and 0 < A < 180, find, without using tables or calculators, the value of
(i) sin A

. (ii) cos A

Step-by-step explanation:

0° < A < 180° so it is in Quadrant I or II

since tan A is negative, it is in Quadrant II ---> (-x, +y)

Next, find the hypotenuse given that x = -13 and y = 9

(-13)² + (9)² = r²

         250 = r²

         5√10 = r

black/brown

step-by-step explanation:

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