Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this Bitesize GCSE Maths Edexcel guide.

Pages Sin, cos and tan Before we can use trigonometric relationships we need to understand how to correctly label a right-angled triangle.

Sin θ - Ratio of Perpendicular to Hypotenuse Cos θ - Ratio of Base to Hypotenuse Tan θ - Ratio of Perpendicular to Base Tips and Tricks to Learn Trigonometric Formulas, Table and Signs Easily ...

Well, there's a GIF for that: Wikimedia Next, think about the relationship between sine, cosine and the circle. Here's an illustration of the fundamental relationship between the three.

Q2. If sin ⍬ =x and sec⍬ = y, then tan ⍬ is equal to Q3. If Cos A = ⅗, find the value of 9 + 9 tan 2 A Q4. If 0 ≤ A, B ≤ 900 such that Sin A = ½ and Cos B = ½ , A + B = Q5.