Question

Am nevoie de ajutor la 206 si 208 :) Va Rog !!!

Answer 1

ex.206
$cosx= \frac{ \sqrt{21} }{5}// sinx= \sqrt{1-cos^2x}= \sqrt{1- \frac{21}{25} }= \sqrt{ \frac{4}{25} }= \frac{2}{5} \\ ex.208 \\ f(3)=0 \\ 0=3-a \\ a=3$