Sin B = -3/4. 180 < B < 270. Sin(90 - B) = ?

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if Sin B = -3/4. and 180 < B < 270. Sin(90 - B) = ?

Guest Mar 30, 2015

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Best Answer

+128731

+5

If SinB = -3/4 ....then....

cosB = -√(16 - 9) / 4 = -√7/4

So

sin (90- B) =

sin 90 cos B - sin B cos 90 =

sin 90 cos B =

1 * cos B =

(1) (-√7/4) =

-√7/4

CPhill Mar 30, 2015

1⁺⁰ Answers

+128731

+5

Best Answer

If SinB = -3/4 ....then....

cosB = -√(16 - 9) / 4 = -√7/4

So

sin (90- B) =

sin 90 cos B - sin B cos 90 =

sin 90 cos B =

1 * cos B =

(1) (-√7/4) =

-√7/4

CPhill Mar 30, 2015

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