IF U HELP ME I WILL GIVE U A COOKIE AND BRAINLIEST

Answer:
-sqrt(13)/3
Step-by-step explanation:
Hypotenuse² = 4² + 6² = 52
Hypotenuse = sqrt(52)
Sin(A) = -6/sqrt(52) = -3/sqrt(13)
Csc A = 1 ÷ sinA
= -sqrt(13)/3
sqrt: square root