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# C3 - trig watch

2. (Original post by morgan8002)
I don't see an image, but factorising is the way to go. Do you see where to go now?
The image is posted below, is that correct? I'm sorry that it took so long....
3. Can someone please tell me how are the two equations identical. I dont know how you to end up from the top identity to the second identity
4. (Original post by john122334455)
Can someone please tell me how are the two equations identical. I dont know how you to end up from the top identity to the second identity
You need to be able to recognise the sin, cos and tan of 0, 30, 45, 60, 90 degrees and the equivalent in radians.
5. (Original post by john122334455)
Can someone please tell me how are the two equations identical. I dont know how you to end up from the top identity to the second identity
Do you not recognize tan 45 from a "special" triangle? (I think perhaps this is GCSE knowledge you may have forgotten, but I may be mistaken.)

If not, draw yourself a right-angled triangle with a 45 degree angle in it. What must the remaining angle be? So what type of triangle do you have?
6. (Original post by davros)
Do you not recognize tan 45 from a "special" triangle? (I think perhaps this is GCSE knowledge you may have forgotten, but I may be mistaken.)
We didn't get taught it until C2. Eiher way it's a useful thing to remember.
7. (Original post by morgan8002)
We didn't get taught it until C2. Eiher way it's a useful thing to remember.
Really? That't terrible! (Not you, I mean - it's terrible that something that basic isn't taught as part of GCSE trig.)
8. (Original post by davros)
Really? That't terrible! (Not you, I mean - it's terrible that something that basic isn't taught as part of GCSE trig.)
I agree. A lot of people I know forget it by second year too, becoming too reliant on calculators.

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