Lol this one troubling me badly.(adsbygoogle = window.adsbygoogle || []).push({});

Simplify 1+cos(180+2u) let 90+u be f

1+cos(2f)

then 1+ cos^2 (f) - sin^2 (f)

umm then it's 2 Cos^2 (f)

lol i'm a bit lost.

what do you after that lol, or do you do it an easier way .Thanks in advance

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# Simple Trig help

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