

Derivatele funcțiilor trigonometrice
Presentation
•
Mathematics
•
9th - 12th Grade
•
Hard
Roxana G
FREE Resource
9 Slides • 4 Questions
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Soluție
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Soluție
Derivând f(x), avem
f′(x)=(5cos3x)′+(2)′.
Aplicarea regulii lanțului dă
f′(x)=5×(−sin3x)×3+0=−15sin3x. □
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Open Ended
Demonstrați că derivata lui tanx e sec2x.
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Soluție
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Soluție
Folosind regula lanțului, obținem
y′=cosh(sinx+cos(2tanx))+(sinx+cos(2tanx))′
=cosh(sinx+cos(2tanx))+cosx+(cos(2tanx))′.
Folosind din nou regula lanțului, avem
cos (2tanx)=−sin(2tanx)×2sec2x. Deci
y′=cosh(sinx+cos(2tanx))+cosx+(−sin(2tanx))×2sec2x
=cosh(sinx+cos(2tanx))+cosx−2sin(2tanx)sec2x. □
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Bibliografie
Derivatives of Trigonometric Functions. Brilliant.org. Retrieved 16:42, April 5, 2023, from https://brilliant.org/wiki/derivative-of-trigonometric-functions/
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