SOLUTION: Hi ! I have a couple of questions that I am stuck on! First: Express sin(x^2+1) in terms of sin(x^2) and cos(x^2) second: Express tan(x+2) in terms of tan(x). On

Question 163546: Hi !
I have a couple of questions that I am stuck on!
First:
Express sin(x^2+1) in terms of sin(x^2) and cos(x^2)
second:
Express tan(x+2) in terms of tan(x).
One other question I have, if you are given coordinates is it possible to work out the equation of a straight line from the coordinates?
e.g. my question is:
Find the equation of a straight line which passes through the points (-1, -5) and 3,3)
Really appreciate any help i can get! Thanks!!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
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3.Yes, you can calculate the slope from the two points.
Then use the point-slope form of a line.
First, the slope,

Now that you have the slope, use the point-slope form,

You can use either point.

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Here's graphical verification.

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