Question

Find cos(π/3 + a), where sin(a) = (1/√3), and 0

Answer 1

a= approx 35.2644

cos(pi/3+a)= approx 0.999998973

Explanation:

solve for sin(a)

sin a = (1/sqroot of 3)

arcsin sin(a) = arcsin(1/sqroot of 3)

a= arcsin(1/sqroot 3)

a=approx 35.2644

now substitute a into the cos formula

Answer 2

answer is (1/2) when a=0