Question

Cos 15degree
Without point

Answer 1

0.9659 is the value of cos15

Answer 2

Cos 15°

=cos 60°- cos 45°

$1 \div 2 - 1 \div \sqrt{2}$

=

${ \sqrt{2} - 2} \div 2 \sqrt{2}$

$4 - 2 \sqrt{2 } \div 8$

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