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Precalculus Trigonometry

Lorena T.

asked • 03/24/23

Given that sin(220°) =-0.643, find the following without using a calculator.

Given that sin(220°) =-0.643, find the following without using a calculator.

a. sin(310°)

b. sin(140°)

c. cos(310°)

d. cos(230°)

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1 Expert Answer

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Raymond B. answered • 03/24/23

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sin220 = =-.643

s220 = sin(180+40)

sin(180-40) = sin140 = -sin220 = +.643

cos310 = cos50=sin40 = .643

cos230 = -cos50 =-.643

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Lorena T.

sin(310°)?

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03/24/23

Dayv O.

is -sqrt(1-.643^2) acceptable answer? cos(310)=.643 and at 310 degrees sin<0 and sinx=+/-sqrt(1-cos^2(x))

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03/24/23

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