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17-09-2018
Mathematics

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Suppose sin(θ)=1/4, where θ is in radians. Find exact values (as fractions, not decimal approximations) for the following.

(a) cos(π2−θ) =

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Аноним Аноним

17-09-2018

Just by using associate angles identities, you have

[tex] \cos\left(\dfrac{\pi}{2} - \theta\right) = \sin(\theta) [/tex]

So, you also have

[tex] \cos\left(\dfrac{\pi}{2} - \theta\right) = \sin(\theta) = \dfrac{1}{4} [/tex]

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