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Question Number 174853 by Mastermind last updated on 12/Aug/22

$$\mathrm{By}\mathrm{first}\mathrm{principle},\mathrm{solve}{\cos }^2\mathrm{x}+{\sin }^2\mathrm{x}=1$$

Commented by daus last updated on 13/Aug/22

$$whatdoyoumeansbyfirstprinciple?$$

Commented by Mastermind last updated on 13/Aug/22

$$\mathrm{Differentiate}\mathrm{by}\mathrm{first}\mathrm{principle}$$

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