I don't know how to do does it matter if its acute? Is there a different formula

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secondary 3 | E Maths
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secondary 3 E Maths Singapore

I don't know how to do does it matter if its acute? Is there a different formula for acute and obtuse?

Date Posted: 7 months ago

Cos (theta) = -cos(180-theta)
Cos 150 = -cos(y)

Y=180-150
Y=30

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Date Posted: 7 months ago