Question

how cos20cos4.cos60cos80is1/16

Answer 1

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please refer to the attachment above



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Answer 2

$\huge{Hello Friend}$

The answer of u r question is...✌️✌️

Given,

Cos20 cos40 cos60 cos80 =1/16

Cos (tita)cos(60-tita) cos(60+tita) = 1/4 cos30

So,

LHS = cos20 cos40 cos80 1/2

=(cos60/4)1/2

=1/16

Thank you..⭐️⭐️⭐️