Question

Question #c1c34

Answer 1

`cos(2arcsin(-(√2)/2))`

`=cos(2arcsin(-(1/sqrt2))`

`=cos(2arcsin(-(sin(pi/4))`

`=cos(2arcsin(sin(pi-pi/4))`

`=cos(2arcsinsin((3pi)/4))`

`=cos(2xx(3pi)/4)`

`=cos((3pi)/2)`

`=cos(pi+pi/2)`

`=-cos(pi/2)=0`