Answer:
b
Step-by-step explanation:
Answer:
The mistake is adding and there is no way to solve if you have to add
Step-by-step explanation:
Answer:
x = 8
Step-by-step explanation:
30x = (60)(40)
30x = 240 Multiply 60 and 40
x = 8 Divide 30 from both sides
We have:

Then we use trigonometric identities to change the negative sign of the trigonometric functions, so:

We clear f(x):

we simply what we can:

Thus, the correct answer is;