Prove that: \ s in 50^0+s in 10^0=cos 20...

Prove that: `\ s in 50^0+s in 10^0=cos 20^0`

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Prove that: \ sin 50^0+sin 10^0=cos 20^0

Prove that: s in50^(@)+s in10^(0)=cos20^(@)

Prove that: sin 40^0+sin 20^0=cos 10^0

Prove that : (cos 20^0 - sin 20^0)/(cos 20^0 + sin 20^0) = tan 25^0

Prove that : (cos 10^0 - sin 10^0)/(cos 10^0 + sin 10^0) = tan 35^0

Prove that: sin 80^0-cos 70^0=cos 50^0

Prove that: s in40^(@)+s in20^(0)=cos10^(@)

Prove that: \ cos 20^0cos 40^0cos 80^0=1/8

Prove that: s in10^(0)s in50^(0)s in60^(0)s in70^(0)=(sqrt(3))/(16)

Prove that sin 20^(@) + sin 140^(@)-cos 10 ^(@) =0

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