Question

плииииз быстрееееееееее 1 , 6

Answer 1

1) - 7Cos2α = -7 * (1 - 2Sin²α ) = - 7 * (1 - 2 * (0,5)²)) = - 7 * (1 - 0,5) = - 7 * 0,5 = - 3,5

$6)\frac{Sin2t-2Sint}{Cost-1} =\frac{2SintCost-2Sint}{Cost-1}= \frac{2Sint(Cost-1)}{Cost-1} =2Sint$

Answer 2

1)-7Cos2a=-7*(1-3Sin2a)=-7*(1-2*(0,5)2))=-7*(1-0,5)=-7*0,5=-3,5