jetblackcap jetblackcap
  • 04-06-2019
  • Mathematics
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Please help me out please!! :)

Please help me out please class=

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Аноним Аноним
  • 04-06-2019

Starting from the Pythagorean identity, we deduce

[tex]\sin^2(x)+\cos^2(x) = 1 \iff \cos^2(x) = 1-\sin^2(x) \iff \cos(x) = \pm\sqrt{1-\sin^2(x)}[/tex]

If we plug in the value 7/10 for sin(x), we have

[tex]\cos(x) = \pm\sqrt{1-\dfrac{49}{100}} = \pm\sqrt{\dfrac{51}{100}}=\pm\dfrac{\sqrt{51}}{10}[/tex]

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