SOLUTION: I need help finding the exact values
Use a double-angle identity to find the exact value of each expression.
1. sin 120°
2. tan 60°
3. cos 4Ï€/3
4. sin
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Question 1139293: I need help finding the exact values
Use a double-angle identity to find the exact value of each expression.
1. sin 120°
2. tan 60°
3. cos 4Ï€/3
4. sin 5Ï€/3''.
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
Use a double-angle identity to find the exact value of each expression.
1.
..........use identity
=
=
=
=
=
2.
°
=
=......................... and
=
=
=
=
=
3.
=
=
=
=
=
4.
=
=..........use
=
=
=
Answer by ikleyn(52810) (Show Source): You can put this solution on YOUR website!
.
You do not need to use "a double-angle identity to find the exact value of each expression."
Every student, studying trigonometry, must know and keep in his (or her) memory
the values of trigonometric functions of the given remarkable (particular) angles.
In the same way as every student must know the multiplication table.
1. sin(120°) = .
2. tan(60°) = .
3. = .
4. = .
See these sources
https://en.wikipedia.org/wiki/Trigonometric_functions
https://en.wikipedia.org/wiki/Trigonometric_functions
https://en.wikipedia.org/wiki/Unit_circle
https://en.wikipedia.org/wiki/Unit_circle
or learn it from any textbook on Trigonometry.
Happy learning this "multiplication table" of Trigonometry !
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