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You need to know that sin, cos and tan are trigonometric functions and some of the values of these functions are expressed using irrational numbers.
Take several values between 0 and 90 degrees.
Take the angle of 30 degrees:
`sin 30 = 1/2 ; cos 30 = sqrt3/2 and tan 30 = sin 30/ cos 30 = sqrt3/3`
Take the angle of 45 degrees:
`sin45 = sqrt 2/2 ; cos45 = sqrt2/2 and tan45 = sin 45/ cos45 = 1`
Take the angle of 60 degrees:
`sin 60 = sqrt3/2 ; cos 60 = 1/2 and tan 30 = sin 60/ cos 60 = sqrt3`
Therefore, in some of the values of the functions sine, cosine and tangent you may find irrational numbers (radicals).
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