Answer:
f(x) = sec x. tan x
⇔ f(x) = 1/cosx . cosx/sinx
⇔ f(x) = sin x
+) when f(x) is increasing => sin x increases
=> x will increase
+) f(x) is decreasing => x will decrease
+) f(x) is concave up => x ∈ (-pi/2; 0)
+) f(x) concave down => x ∈ (0; pi/2)
Step-by-step explanation:
Answer:
3,6,9,27 and 2,4,6,18
Step-by-step explanation:
It simple
Sum of all the interior angles of a n-gon = (n-2) x 180
Sum of all the interior angles of a 72-gon = (72-2) x 180 = 12600°
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Answer : 12600°
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