Question 1

Dokazati $\cos\left(\frac{\pi}{4}+x\right)\cos\left(\frac{\pi}{4}-x\right)=?$

Accepted Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Question 2

$\frac{\cos2x}{2}$

Accepted Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Question 3

$\frac{\cos2x}{2}$

Accepted Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Question 4

$\frac{\cos2x}{2}$

Accepted Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Answer

$\frac{\cos2x}{2}$

Question 5

$\frac{\cos2x}{2}$

Accepted Answer

$\frac{\cos2x}{2}$ , $\sin\left(-225\degree\right)=\frac{\sqrt{2}}{2}$

Answer

$\frac{\cos2x}{2}$ $\sin\left(-225\degree\right)=\frac{\sqrt{2}\left(\sqrt{3}-1\right)}{4}$

Answer

$\frac{\cos2x}{2}$ $\sin\left(-225\degree\right)=\frac{\sqrt{2}\left(\sqrt{3}-1\right)}{4}$

Answer

$\cos\left(\frac{\pi}{4}+x\right)\cos\left(\frac{\pi}{4}-x\right)=?$ $\sin\left(-225\degree\right)=\frac{\sqrt{2}}{2}$

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