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FlamesPuck12 · 04-11-2009, 06:39 PM

Question 5:

From the Pure Mathematics 30 Formula Sheet (You do have the formula sheet, right?)
cos(A - B) = cos A cos B + sin A sin B
A = 38°
B = 8°

= cos 30°

Using the 30°-60°-90° special triangle:
cos 30° = SqRt(3) / 2

04-11-2009, 06:39 PM	#26
FlamesPuck12 First Line Centre Join Date: Apr 2007 Exp:	Question 5: From the Pure Mathematics 30 Formula Sheet (You do have the formula sheet, right?) cos(A - B) = cos A cos B + sin A sin B A = 38° B = 8° = cos 30° Using the 30°-60°-90° special triangle: cos 30° = SqRt(3) / 2