Question

Find exact value if:
0 < x < pi/2. and 0 < y < pi/2
Sin ( x-y) if sin x = 3/5 and sin y= 4/5

Answer 1

sin(x-y)=sin(x)cos(y)-cos(x)cos(y)

sin(x)=3/5 ==> cos(x)=4/5, and sin(y)=4/5 ==> cos(y)=3/5

sin(x-y)=(3/5)(4/5)-(4/5)((3/5)
=0

Answer 2

your answer is the same my,but the key is :24/25

Answer 3

that would be the answer for sin(x+y)

Answer 4

tk any way

Answer 5

I check (x-y)
not (x+y)
don't worry

Answer 6

tk any way

Answer 7

your answer is the same my,but the key is :24/25