Helpful UNCOMMON Trig Identities?

[jwnichols21]

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Hey Everyone,

Was wondering if anyone encountered any OTHER useful Trig Identities on their DAT for the QR section, aside from the ones below. Thanks!!

sin^2(x) + cos^2(x) = 1

sin(2x)=2sin(x)cos(x)
cos(2x)=cos^2(x)-sin^2(x)

tan^2(x)+1=sec^2(x)
cot^2(x)+1=csc^2(x)

 

[tvndental]

sin^2(x) + cos^2(x) = 1
tan^2(x)+1=sec^2(x) (divide top by cos^2(x))
cot^2(x)+1=csc^2(x) (divide top by sin^2(x))

These are all the same equation.

 

[Demps]

Math Destroyer first page is sufficient for trig 🙂

 

[jwnichols21]

Thanks to both of you!