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Find the exact value of sin (-5pi/3) without using a calculator
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Find the exact value of sin (-5pi/3) without using a calculator

User Vignesh Raja
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2 Answers

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Without a calculator use the unit circle. Cos is x and sin is y. 5pi/3 is( 1/2, -sqrt3/2), Since cos of 5pi/3 is 1/2 (x) sin your y coordinate is -sqrt 3/2. Since you have a negative you want positive I think it's just sqrt 3/2.
User Himanshu Sheoran
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7.2k points
3 votes
i got .866 but i rounded up for .87
hope i helped add me
Dosvedanya :)

User RichK
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8.6k points
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