Find the value of θ that makes each statement
true.
a) sin θ = cos(30°)
b) sin 80° = cos θ
c) cos(θ + 15°) = sin(θ)
d) sin(θ + 38) = cos θ
e) cos θ = sin(θ – 30)
f) sin(θ/3+ 10) = cos θ