Trigonometry

How to remember the exact values of trigonometric functions

How to remember the exact values of trigonometric functions

cosine exact values remember sin tangent trig Authored By Carmen Popescu-Rose

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...

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