Question

Given that sinA = 5/13 and cosB = -4/5, where A and B are in the same quadrant, What is the value of cosA?

Answer 1

Skkdjdiskssi8₹838484849dododododododododododod

Answer 2

Answer:  cosA= -12/13

Step-by-step explanation:

Sin is positive and cos is negative means A and B lies in the 2nd Quadrant.

sin²A+cos²A=1

25/169+cos²A=1

cos²A=1-25/169

cos²A=144/169

So, the value of cosA could be 12/13 or -12/13

Since, A lies in the 2nd quadrant value of cos A will be negative.

So, ans will be -12/13