William812
Give the exact value of the expression without using a calculator:
sin(2cos(inv) 1/5)



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AKANicole
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idk

telijahmed
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let cos(inv) 1/5 = A

telijahmed
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\[\sin (2A)= 2sinAcosA\]

telijahmed
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what is A you substitute

telijahmed
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\[2\sin (\cos ^{1}1/5) \cos (\cos ^{1}1/5)\]

telijahmed
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\[2\sin (\cos ^{1}1/5) * 1/5\]

telijahmed
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can you go on from here