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Math SL help please :(

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given that tanx=a/b, pi is greater or than x < 3pi/2

evaluate

cos4x

this is a trig identity

i thought it would be

1-2sin22x

but not sure what to do next

please help

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yeah doesn't really help, is a and b amplitude and phase shift or something? also is that the entire question? it looks like you used the Pythagorean identity with a double angle formula or something, not exactly sure if that is right, i might need to brush up on sl trig

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It would really help if you rewrote the question using proper notation, used Latex or included a scan of the book where the question is.

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