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Question Number 137813 by bramlexs22 last updated on 07/Apr/21

$$\cos \left(\arctan \left(\frac{21}{60}\right)\right)=?$$

Answered by mr W last updated on 07/Apr/21

$$sayt={\tan }^{-1}\frac{21}{60}$$$$\tan t=\frac{21}{60}=\frac{7}{20}$$$$\cos t=\frac{20}{\sqrt{{20}^2+7^2}}=\frac{20}{\sqrt{449}}$$$$i.e.\cos \left(\arctan \left(\frac{21}{60}\right)\right)=\frac{20}{\sqrt{449}}$$

Commented by bramlexs22 last updated on 07/Apr/21

$$thankyou$$

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