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What is the reference angle of sin(-45)?

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Apr 26, 2015

Assuming you mean $- 45$ $-45$ radians, the reference angle is $14 π - 45$ $14pi - 45$

$45 \div 2 π \approx 7.16$ $45 -: 2 pi ~~ 7.16$ and

$14 π \approx 43.98$ $14 pi ~~ 43.98$

So, to get $- 45$ $-45$ that only leaves about $- 1.02$ $-1.02$ which is a 4th quadrant angle with reference angle $1.02$ $1.02$ .

The exact value is $14 π - 45$ $14pi - 45$

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