Problema Solution
If cosθ=2/5. Write down tanθ and sinθ in their exact form.
Answer provided by our tutors
cos(I) =2/5 == > sin2(I) = 1- cos2(I) = 1 - 4/25 = 21/25
==> sin (I) = (21)1/2/5
== > tan(I) = sin(I)/cos(I) = (21)1/2 / 2
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