Here's the sum rule for the tangent function:

In the special case a=b, this becomes the double angle formula:

In your case, you case use the sum rule once:

And use it again, in the special case of the double angle:

We can obvisouly simplify this expression a lot: let's deal with the numerator and denominator separately: the numerator is

and the denominator is

So, the fraction is

Answer:
Explanation: If a figure reflected across the x-axis then the x-coordinate remains same but the sign of y-coordinate changes
Step-by-step explanation:
Answer:
I think 29
I don't know if it's right
First, find the nth term
To do this, find the term to term difference...
A
-7 and 3 = 10
3 and 13 = 10
13 and 23 = 10
As the difference is 10, we now write out the 10 times table
10, 20, 30, 40
The next step is to work out how to get from the sequence to the 10x table
B
-7 - 10 = -17
3 - 20 = -17
13 - 30 = -17
23 - 40 = -17
Now use the answer from each section in the general formula
x = An + B
This could also be written as ?n + ?
Using our numbers, this becomes 10n - 17
Now use the formula to work out the 110th term
(10 x 110) - 17
1100 - 17 = 1083