Year 13 Maths Help Thread

That angle should be 22 not 68:


I may have confused you earlier when I mentioned the 68 degree angle, which is actually the other angle in the triangle.

Oh right, why is 22 degrees now inside the triangle?

Look at what I've done in the diagram. I've moved the P force to create a triangle of forces and the angle is 22.

Ok thank you. How do I start the next question? Sorry I'm struggling with this topic.

For this topic you need to move around the forces to make a triangle of forces:



Can you see what one of the angles in the triangle must be? Then can you use this to find theta?

Is the angle in the bottom right corner 30 degrees?

Yes, because they are alternate angles.

You can now use trigonometry for the rest of the question.

Does anyone know how to differentiate (lnx)(lnx)?

@Zacken any tips for fp2 polar stuff? Feels weird after having done everything in Cartesian in all my time doing maths

You'll get used to it after some practice. Surely you worked with polars in complex numbers in whatever module you learnt them? Was it FP1, I don't remember.

I'm stuck at a differentiation q:

3)a) The point P lies on a curve with the equation y + 1/2 = sin(x + y) + pi/3
P is the point (k, pi/3). Find the smallest possible positive value of k.

This is what I've done so far (I don't even know if it's correct or not):
I'm at a dead end right now

Do you think you're too prestige to make a thread and ask for help??? smh....

Also, in your workings you have $y + \frac{1}{2} = \sin(x-y) + \frac{\pi}{3}$ but the question you have given to us is $y + \frac{1}{2} = \sin(x + y) + \frac{\pi}{3}$

Do you know how to express trig functions of the form $a\cos x + b\sin$ in harmonic form?

Oh soz it was a typo i meant what I've got in my workings
Harmonic form? I'm not sure?

??

Do you know how to express trig functions of the form $a\cos x + b\sin$ in harmonic form?

Oh soz it was a typo i meant what I've got in my workings
Harmonic form? I'm not sure?