5.1.2 Values of Tangent, Sine and Cosine
1. The values of the trigonometric ratios of 30o, 45o and 60o (special angle) are as below.
2. 1 degree is equal to 60 minutes.
1o= 60’
3. A scientific calculator can be used to find the value of the sine, cosine or tangent of an angle.
Example:
sin 40.6o = 0.5954
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Calculator Computation
Press [sin] [40.6] [=] 0.595383839
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4. Given the values of sine, cosine and tangent, we can find the angles using a scientific calculator.
Example:
tan x = 1.7862
x = 67o30’
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Calculator Computation
Press [shift] [tan][1.7862]
[=][o’’’] 67o30’
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