Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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If you really can't get it I'll explain how to do it, but you really ought to learn to do this for yourself. I wouldn't really be helping you if I just did the problem for you.
Also note the identiy for sin(2x) and the three identities for cos(2x).
I could work it out myself but I think you should.
I got another trig problem, which is to prove (make the left side of the "=" equal to the right side).