It has to be one of the negative answers. I’m not sure which one but I am sure it’s a negative number. :)
Cos9x - cos5x = -2sin2x.sin7x
sin17x - sin3x = 2sin7x.cos10x
so f(x) =

=
If you would like to know what is y when x = 42, you can calculate this using the following steps:
x = 8 ... y = 20
x = 42 ... y = ?
8 * y = 20 * 42 /8
y = 20 * 42 / 8
y = 105
The correct result would be: y = 105 when x = 42.
Answer:
Check the explanation
Step-by-step explanation:
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Answer:
2 x54 + 2 x 54
108 + 108
216
Step-by-step explanation: