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Both the cosine and sine rule are used to find either a missing side length or angle of a triangle that doesn't have a right angle. The cosine rule is used when you know the length of two sides and the an...
sin2x = 2sinxcosxcos2x = cos2x - sin2x=2 cos2x - 1= 1 - 2sin2xtan2x = (2tanx)/(1-tan2x)
The first thing when seeing such a question is to find out what the question wants you to do and plan your method to do so.In this case, the question asks you to find the normal of a curv...
FOIL Method: F - First xx = x2 O - Outside x7=7x I - Inside -3x=-3x L - Last -37= -21 Add all the results up to get the answer: x2+7x-3x-21 = x2MLAnswered by Martin L. • Maths tutor7146 Views
2x^2 - 3x - 4 = 1To solve, we should bring all the terms to one side, and equate the equation to 0. To do this, we should subtract 1 from each side.2x^2 - 3x - 4 - 1 = 1 - 12x^2 - 3x - 5 = 0PSAnswered by Prithvie S. • Maths tutor3789 Views
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