Answer:
25
Step-by-step explanation:
You need to reverse the operations given that 60 is equal to (2x+10)
so first you would subtract 10 from 60 that would equal 50. that divide by two to get 25.
Answer is sin(4x)sin(10x)/4
Hope this helps!
2x - 20 = x + 15
x = 35
Now plug x in:
2*35 - 20 = 50 degrees