у = ctgx/5
y' = -1/5sin²x
-1/(5*sin²(π/3)) = -1/(5*3/4) = -1/15*4 = -4/15
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у = ctgx/5
y' = -1/5sin²x
-1/(5*sin²(π/3)) = -1/(5*3/4) = -1/15*4 = -4/15