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## How to remember the exact values of trigonometric functions

When you see the table shown below of exact values of the trigonometric functions sin(x), cos(x) and tan(x) you always wonder "How am I going to remember them!?". Here is an easy way to work them out without having to memorise them. First of all the sine function increases from 0° to 90°. sin(0°) = 0 and sin(90°) = 1 Step 1 Write the numbers 1, 2 and 3 from left to right in the empty cells in the sin(x) row as shown below. Step 2 Square root these three numbers. Step 3 Draw a fraction line underneath each number. Step 4 Write a...