Cos (π/2 - x) = sin x = 3/5
tan x = sin x / cos x = 3/5 / 4/5 = 3/4
csc x = 1/sin x = 1 / 3/5 = 5/3
sec x = 1/cos x = 1 / 4/5 = 5/4
cot x = 1/tan x = 1 / 3/4 = 4/3.
In 144 minutes, or at 5:19 pm, the trains will arrive at the same time again.
Dont spend it. Spend less. Dont give it away.
Answer:
12.B
13.C
17.D
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