TRIGO

I'm not understanding why $tan \theta$ $= -\frac {7}{24}$

Find the value Cos $\theta$ and tan $\theta$, given that Sin $\theta$ = -\frac {7}{25}

I'm not understanding why $tan \theta$ $= -\frac {7}{24}$

Find the value Cos $\theta$ and tan $\theta$, given that Sin $\theta$ = -\frac {7}{25}

$\cos \theta$ is positive in the fourth quadrant (think CAST diagrams) but tan is negative there.

In either case, knowing that $\cos \theta$ is positive is enough. Because $\tan \theta = \frac{\sin \theta}{\cos \theta} = \frac{\text{negative}}{\text{positive}} = \text{negative}$.

too late

The day we learned about trigo graphs & cast diagrams I was ill.

The book sucks. Know of anywhere that I can learn this?

Must you keep posting unneeded and often crudely sarcastic comments on every thread? This really is unacceptable.

I am sorry you feel so...
I beginning to dislike you ...

The honour... By the way, your IYGB Special Papers are riddled with errors. For example, Paper Z Question 2. The fact that as written, the denominator is sqrt(x+sqrt(x^2-1)) makes it impossible. What was intended was presumably sqrt(x)+sqrt(x^2-1) (note that the two square roots are separate, rather than the second being within the first), which is indeed what you start out with in your solution. I could go on, but I'd rather not. Anyway mate, the point is whatever ego and perceived reputation you may have built up for yourself, you're a nobody. Have a good day!

Here you go.

Thanks!

Another question: Eliminate $\theta$ to give an equation relating x and y:

c) $x = Sin \theta$ , $y = Cos^2 \theta$

Would this be ok?

$Sin \theta = \sqrt1-Cos^2\theta$

$x = \sqrt1-y$

I don't know how to extend the square root in latex but you catch my drift

1. If you want to extend the square root use \sqrt{1-y}, i.e: put the curly braces around it.

2. That would be okay, I suppose...

3. It's a very ugly answer, $x^2 + y = 1$ is the same thing and looks much nicer, but I doubt you'd lose marks for writing down what you have. So yes, it's perfectly correct.

you clearly have issues

Thank you sir

Thanks you narcissistic piece of ****.

Oi, I'm an A-Level student just like yourself!

If I consider you an A level student, it will just lower my self - esteem.

I mean, I've been trying to grow a beard for 6 months but you make it seem light work.

Did you have a bad day ?
I remember you lost it again in another thread the other day ...
Different username but identical persona...
How old are you please, if you do not mind me asking?