It is 9 because 11 minus 2 is equal to 9.
Answer: 3/4 of an hour left.
Step-by-step explanation:
Step 1: 2 hours = 4/4 +4/4
Step 2: 4/4 - 2/4 = 2/4
Step 3: 4/4 - 3/4 = 1/4
Step 4: 2/4 + 1/4= 3/4
D... flip 1/5 into 5 is the correct way
Sin5x + sin3x = 2sin4x.cosx
cos5x + cos3x = 2cos4x.cosx
so
![\frac{2sin4x.cosx}{2cos4x.cosx}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2sin4x.cosx%7D%7B2cos4x.cosx%7D%20)
=
![\frac{sin4x}{cos4x}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bsin4x%7D%7Bcos4x%7D%20)
= tan4x