Given that sin(pi/3)=root3/2, and cos(pi/3)=1/2, use trig identities to determine the exact values of sin(2pi/3), cos(2pi/3), sin(5pi/6), and cos(5pi/6). WITHOUT USE OF CALCULATOR.
Thank you x
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Mulkeen
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- 10-11-2015 20:53
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davros
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- 10-11-2015 21:54
(Original post by Mulkeen)
Given that sin(pi/3)=root3/2, and cos(pi/3)=1/2, use trig identities to determine the exact values of sin(2pi/3), cos(2pi/3), sin(5pi/6), and cos(5pi/6). WITHOUT USE OF CALCULATOR.
Thank you x
What have you tried so far?
What formulas do you know that might help you? -
nerak99
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- 11-11-2015 14:16
To get started. You need to express the target angle in terms of the angles you have using the double angle formula and the formula for sum/difference of angles
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- 11-11-2015 15:03
Use your double angle identities, and as you move on to cos(5pi/6) and sin(5pi/6), you see that they logically follow.
Hint: cos(2pi/3 + pi/6)...
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