Question

Find cos A if sin A=3/5​

Answer 1

Explanation:

for sin we divide the opposite by the hypotenuse

and for cos we require the adjacent divided by hypotenuse

we can get it through

a²+ b²=c²

ur unknown in this case is the adjustment which you can either substitute with a or b

a² + 3²=5²

a²=5²-3²

a²= 25-9

a²= 16

$\sqrt{a ^{2} } = \sqrt{16}$

a=4

so that now we have found that I just sent we can find the cos of A

cos A= ⅘