Prove . Cosec2A+Cosec4A+Cosec8A = Cot A- Cot 8A . Class 10 optional maths

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find the limit, functional value and examine continuity or discontinuity: f(x) = (x ^ 2 - 4)/(x - 2) at x = 2
plz
and next qn:
if f(x)= (2x ^ 2 - 50)/(x - 5), x is not equal 5) (k, x=5)

is continuous at x=5, then find the value of k.
plz solve

sachinff