Question 1173206
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Hi  
P(2,45°)  to P(x,y)
Polar coordinate P(r, θ )  {{{r = sqrt(x^2 + y^2) }}}
P(2,45°):  r = 2 and θ = 45°
 P(x,y) = P(rcosθ , rsinθ)= P(2cos45°, 2sin45°)= P(2(√2/2), 2(√2/2)) = P(√2,√2)
r = sqrt(2 + 2) = 2  Answers check.
This (cosx, sinx) wheel a quick reference.
*[illustration wheel].