A-Level Maths: E1-06 [Trigonometry: Finding Exact Values of sin(x), cos(x) & tan(x)]

[Sheenaization]

Much easier to understand than that CAST diagrams books and teachers always bang on about!
Also random question but where did the whole concept come from with sin, cos, tan? In the real world would you need ti use the graphs of these functions?

[sarahtumelo]

Best Teacher ever, thank you so much.

[AndreaMotion-clcy]

11:46 hi jack, I know the angles in question are obtuse but when drawing the sin x graph why do you stay between 90 and 180?

[karotic]

inverse tan(x)=-43/6root66 gives me -43.41 on the calculator which is not an obtuse angle. I’m confused.

[tallula]

The proof of each trigonometric function shows that sin(x) is the value of the height of the triangle, the cosine(x) is the width and the tan(x) is the gradient. So when we are working out in this question the values of tan and cosine we input them into the ratio given by SohCahToa and not just simply out them as either the height, width or gradient? Can someone please expalin my confusion as i feel the two rules are contradictory. I feel it has somthing to do with the radius being the value of one in the proof example?

[x_nova_x]

sir how would you do it if it said something like cos squared or sin squared or something

[Ss-btto]

How 6 Sqrt root?? Is not it 65 squared times 43 then we put the result in sqrt?

[johnsergie]

Hi, Sorry to bother you but please can you help me with this question, It would be highly appreciated.

Solve, for -180<x<180
tan(x-40)=1.5

Thanks