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trigonometriuppgift
Bevisa:
[math] \frac{sin(x+\frac{\pi}{4})}{sinx} + \frac{cos(x-\frac{\pi}{4})}{cosx}=\sqrt{2}+\frac{\sqrt{2}}{sin2x}[/math]
Genomgång finns på: https://vimeo.com/41723460