Given cos θ = 0.707, where 0 < θ < π 2 , find sin θ . then find the tan θ .

We know that
if 0 < θ < π/2
then 
angle θ> belong to the first quadrant
so
sin θ and cos θ> are positive numbers

sin²θ+cos²=1> sin²θ=1-cos²θ> sin²θ=1-(0.707)²> 0.50
sin²θ=0.50> sin θ=0.707

the answer part A) is
 sin θ=0.707

if sin θ= cos θ
then
θ=45°

Part B) find tan θ
tan θ=sin θ/cos θ> tan θ=0.707/0.707> tan θ=1

the answer Part B) is
tan θ=1