Question

value of arccos (sqrt2/2)... So confused!

Answer 1

you just think of arccos as " the angle which the cos is ..." so the angle which the cos is \[\frac{ \sqrt{2} }{ 2}\] is 45°

Answer 2

Ah, same goes for arctg and arcsin haha

Answer 3

so it would be pi/4?

Answer 4

yes 45° =\[\frac{ \pi }{ 4 }\]

Answer 5

thanks!