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;
Answer:
scalene
Step-by-step explanation:
When all sides aren't equal.
Answer:
is there a picture or can you at least finish the sentence
Step-by-step explanation:
Answer:
the answer is 309 r 15
Step-by-step explanation:
309 × 27 is 8343 and your left with 15
Answer:
are u trying to find x?
Step-by-step explanation: