13.1.1. Degrees, Minutes, Seconds
Evaluating Trigonometric Functions of Angles in Degrees, Minutes and Seconds
To find the value of a trigonometric function of an angle measured in degrees, minutes and second such as sin 45º 15' 20" :
To find the value of a trigonometric function of an angle measured in degrees, minutes and second such as sin 45º 15' 20" :
1) Enter the trigonometric function you want to use. In this example, we will use sine.
2) Tap the open parentheses before entering the angle in degrees. Make sure to add the degree symbol.
3) Type in the minutes and tap the 1st derivative key (tap the exponent key twice).
4) Type in the number of seconds and add the 2nd derivative key (tap the exponent key three times). Then add closed parentheses.
Note: To enter a negative angle, enter the trigonometric function followed by a negative sign and then enter the argument in parentheses.
More Examples
Evaluate the following:
a) sin 45º 10' 25"
b) tan (-80º 10' 20")
c) csc (-120º 5' 10")
d) sec 60º 5' 30"
Calculator solutions
Enter each expression as given. Use minutes by tapping the exponent key x^ twice. Use seconds by tapping the exponent key x^n three times. Place the negative sign outside of the measure as shown below.
a) sin 45º 10' 25"
b) tan (-(80º 10' 20"))
c) csc (-(120º 5' 10"))
Enter cosecant by tapping sin three times.
d) sec 60º 5' 30"
Enter secant by tapping cos three times.
Evaluate the following:
a) sin 45º 10' 25"
b) tan (-80º 10' 20")
c) csc (-120º 5' 10")
d) sec 60º 5' 30"
Calculator solutions
Enter each expression as given. Use minutes by tapping the exponent key x^ twice. Use seconds by tapping the exponent key x^n three times. Place the negative sign outside of the measure as shown below.
a) sin 45º 10' 25"
b) tan (-(80º 10' 20"))
c) csc (-(120º 5' 10"))
Enter cosecant by tapping sin three times.
d) sec 60º 5' 30"
Enter secant by tapping cos three times.
