f(x)=sinx5;f(x)=\sin x^5;f(x)=sinx5;
f′=5x4cosx5;f(12)=5∗124cos(125)=5∗1245−14>0f'=5x^4\cos x^5; f(12)=5*12^4\cos(12^5)=5*12^4\frac{\sqrt{5}-1}{4}>0f′=5x4cosx5;f(12)=5∗124cos(125)=5∗12445−1>0
Hence the graph is increasing.
f′′=20x3cosx5−25x8sinx5;f′′(12)<0f''=20x^3\cos x^5-25x^8\sin x^5; f''(12)<0f′′=20x3cosx5−25x8sinx5;f′′(12)<0
Hence the graph concaves down.
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