I'm teaching maths to myself so I don't really have anywhere else to go for an explanation other than here, so I apologise if this seems simple.(adsbygoogle = window.adsbygoogle || []).push({});

How do you get from:

(cos^2θ + sin^2θ)(cos^2θ - sin^2θ)

to

cos^4θ - sin^4θ

NOTE: cos^2θ is shorthand for (cosθ)^2 as is with all the other ones as well.

The question could also be asked in reverse (how do I factorise cos^4θ - sin^4θ)

Please bear in mind that I am teaching maths to myself, so it's pretty useless if you don't explain every mathematical step.

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# Factoring radian equations

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