//tex.z-dn.net/?f=%3Cvar%3Ecos%20x%20%3D%20%5Cfrac%7B4%5Csqrt%7B6%7D%7D%7B5%7D%5C%5C%20tgx%20%3D%20%5Cfrac%7B1%7D%7B4%5Csqrt%7B6%7D%7D%20%3D%20%5Cfrac%7B%5Csqrt%7B6%7D%7D%7B24%7D%5C%5C%20ctg%20%3D%20%5Cfrac%7B1%7D%7Btg%7D%20%3D%20%5Cfrac%7B24%7D%7B%5Csqrt%7B6%7D%7D%20%3D%204%5Csqrt%7B6%7D%3C%2Fvar%3Eнение:
