C3: trigonometry
Question 3 linked below. The only way I could think of answering the question was using the quadratic formula, I'm sure there must be a quicker way of solving this. Also is this a valid answer as not all of the solutions are correct? The other solution gives an angle of -75 degrees.
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
(edited 9 years ago)
Original post by Nuvertion
Question 3 linked below. The only way I could think of answering the question was using the quadratic formula, I'm sure there must be a quicker way of solving this. Also is this a valid answer as not all of the solutions are correct? The other solution gives an angle of -75 degrees.
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
method is essentially correct.
you reject the other solution
Original post by Nuvertion
Question 3 linked below. The only way I could think of answering the question was using the quadratic formula, I'm sure there must be a quicker way of solving this. Also is this a valid answer as not all of the solutions are correct? The other solution gives an angle of -75 degrees.
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
http://i.imgur.com/0HnPHXrh.jpg
http://i.imgur.com/1NcYfJOh.jpg
It's simpler than that.
Original post by BabyMaths
It's simpler than that.
No..... I don't think that can work
Original post by BabyMaths
It's simpler than that.
I was wondering why they mentioned tan(45).
Original post by Jono-Wolf
No..... I don't think that can work
Why do you think that?
I assure you that it does work.
Original post by Jono-Wolf
No..... I don't think that can work
It can using the compound angle formula and it removes the need of using the quadratic formula.
(edited 9 years ago)
Original post by Nuvertion
It can using the compound angle formula.
Sorry, just typed it into my calculater and it is fine, I actually didn't know, that you could that
Original post by Jono-Wolf
Sorry, just typed it into my calculater and it is fine, I actually didn't know, that you could that
Now try it without using your calculator.
Original post by BabyMaths
Now try it without using your calculator.
Without a calculator I would just do that same method as Nuvertion
Original post by Jono-Wolf
Without a calculator I would just do that same method as Nuvertion
Original post by BabyMaths
Thanks, now I understand better
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