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Mathematics

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Please help me solve this trigonometry question!!

1. If sin =12/13 and is in Quadrant II, find the exact value of sin(−/3).

2. Find the exact value of cos11/12 , using 11/12 =/6 +3/4 .

3. If sin =5/6 and is in Quadrant II, find the exact value of sin2,cos2
and tan2.

Answer :

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