$\displaystyle \cos\alpha= \frac{24}{49}$\displaystyle \cos\alpha= \frac{24}{49}

$\displaystyle \cos\alpha= \frac{5}{7}$\displaystyle \cos\alpha= \frac{5}{7}

$\displaystyle \cos\alpha= \frac{25}{49}$\displaystyle \cos\alpha= \frac{25}{49}

$\displaystyle \cos\alpha= \frac{5\sqrt{6}}{7}$\displaystyle \cos\alpha= \frac{5\sqrt{6}}{7}