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Lecture Notes Tr.nometric Iden.ies Sample Problems - Solutions 1. tanxsinx+cosx = secx Solution: We will only use the fact that sin2 x+cos2 x .Tr.nometric functions, iden.ies, formulas and the sine and cosine laws are presented..24/25 Use trig iden.y: cos x - y = cos x.cos y + sin x.sin y We have cos x = 3/5, find sin x We have cos y = 4/5, find sin y sin x = 1 - cos^2 x = 1 - 9/25 = 16/25 --> sin x = +- 4/5 sin y = 1 - cos^2 y = 1 - 16/25 = 9/25 --> sin y = +- 3/5 Since cos x > 0 and cos y > 0, then the arcs x and y are both located in Quadrant I..Trig Iden.ies Welcome to highermathematics.co.uk A sound understanding of Trig Iden.ies is essential to ensure exam success. Please find .

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    Lecture Notes Tr.nometric Iden.ies Sample Problems - Solutions 1. tanxsinx+cosx = secx Solution: We will only use the fact that sin2 x+cos2 x = 1 for all values of x. LHS = tanxsinx+cosx = sinx cosx sinx+cosx =.

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    Tr.nometric functions, iden.ies, formulas and the sine and cosine laws are presented..

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    24/25 Use trig iden.y: cos x - y = cos x.cos y + sin x.sin y We have cos x = 3/5, find sin x We have cos y = 4/5, find sin y sin x = 1 - cos^2 x = 1 - 9/25 = 16/25 --> sin x = +- 4/5 sin y = 1 - cos^2 y = 1 - 16/25 = 9/25 --> sin y = +- 3/5 Since cos x > 0 and cos y > 0, then the arcs x and y are both located in Quadrant I. Their sin are both positive..

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    Trig Iden.ies Welcome to highermathematics.co.uk A sound understanding of Trig Iden.ies is essential to ensure exam success. Please find resources for all other Maths courses HERE. To return to the Home Page please click HERE. We hope you find this website useful and Continue reading .

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