Question

sin(квардат) a якщо cos(квадрат) a=0,7

Answer 1

$\displaystyle\bf\\Cos^{2} \alpha =0,7\\\\Sin^{2} \alpha +Cos^{2} \alpha =1\\\\Sin^{2} \alpha =1-Cos^{2} \alpha =1-0,7^{2}=1-0,49=0,51\\\\Otvet \ : \ Sin^{2} \alpha =0,51$