In this lesson we show you how to draw the sine curve or the sine graph – in other words, a graph of the sine function, y=sin(theta). Please make sure you have done the basic trigonometry and unit circle tutorials so you understand what the sine function does and why you can have an input …
Another tutorial on how to prove trig identities with 2 practice questions. The questions are: 1) 3sin^2x-2cos^2x=5sin^2x-2. 2) cos^2x+tan^2x=sec^2x-sin^2x. Have a go then come and see the answer!
In this tutorial we give you a practice question on proving trig identities. The question is: Prove that (1-sinx)/(1+sinx)=(secx-tanx)^2. Have a go then come and see the answer! p.s. Need to remember how to factorise and expand binomials 🙂
In this tutorial we give you a practice question on proving trig identities. The question is: Prove that (cot^2(x)-1)/(cot^2(x)+1) = 1-2sin^2(x). Have a go then come and see the answer!
In this tutorial we talk about some more Trig identity proofs, including: tan(x) = sin(x) / cos(x) sin^2(x) + cos^2(x) = 1 tan^2(x) + 1 = sec^2(x) cot^2(x) + 1 = cosec^2(x)
In this series of videos I will prove every single trigonometric identity. If you have any that you want to see the proof of, feel free to e-mail me. I suggest starting from the beginning so if you are stuck watching this video, go back to some earlier ones (e.g. the proof of sin(A+B))
In this video I present this proof in the smallest steps possible. All you need to know to understand this are the basic trig rules sin(theta)=opposite/hypotenuse etc.
In this lesson we solve more trigonometric equations, this time using exact values (without a calculator). Must be good with fractions to do this!
In this tutorial we start talking about solving trigonometric equations such as sin(x)=0.5 where x can have multiple answers depending on its domain.
In this lesson we use a combination of techniques that you have learned in previous lessons to find the exact values of trigonometric ratios for angles larger than 90 degrees.