Question

Evaluate without using a calculator: cos(sin^-1(2/7))

Answer 1

\[\cos(\sin ^{-1}(\frac{ 2 }{ 7 }))\] heres a cleaner version of the equation

Answer 2

my guess would to make a triangle. opp/hyp where opp=2 and hyp=7

Answer 3

and then?

Answer 4

theta = arcsin(2/7)
sin(theta) = 2/7

so,