Question

please solve this question ​

Answer 1

Answer:

cm?mmmmmmm?mmmmmmmmmm

Answer 2

cos a =

$\sqrt{(1 + cos2a) \div 2}$

cos 60°=1/2

cos 30° =

$\sqrt{(1 + cos2 \times 30) \div 2}$

=

$\sqrt{(1 + cos60) \div 2}$

=

$(1 + 1 \div 2) \div 2$

=

$(2 + 1) \div 4$

=

$3 \div 4$

Hope it HELPS

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