How do I find the angle using the quadratic equation | Revision Server | Page 1

true pike Jun 1, 2023, 11:19 AM

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I think I am not able to solve this through the quadratic quation

verbal zenith Jun 1, 2023, 11:20 AM

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Whats sin^2 x in terms of cos^2 x ?

true pike Jun 1, 2023, 11:21 AM

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1-sin^2x = cos^2x

verbal zenith Jun 1, 2023, 11:21 AM

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yes

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So that means sin^2 x is 1-cos^2 x

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So you can put that into the equation

true pike Jun 1, 2023, 11:22 AM

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So I get

cos^2 x + 2cos x -2 = 0

I don't think I can use quadratic formula to solve this

verbal zenith Jun 1, 2023, 11:22 AM

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Why not?

true pike Jun 1, 2023, 11:24 AM

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Oh wait

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I realised i misread the minus symbol

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THanks#

#How do I find the angle using the quadratic equation