Question

if y=2, tanx-7secx, find dy/dx.​

Answer 1

Answer:

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ANSWER

Let f(x)=2tanx−7secx 

Thus using first principle,

f′=h→0limhf(x+h)−f(x)

= h→0limh1[2tan(x+h)−7sec(x+h)−2tanx+7secx]

= h→0limh1[2{tan(x+h)−tanx}−7{sec(x+h)−secx}]

= 2h→0limh1[tan(x+h)−tanx]−7h→0lim