cos100^(@)cos40^(@)+sin100^(@)*sin40^(@)...

cos100^(@)cos40^(@)+sin100^(@)*sin40^(@)

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Simplify cos 100^(@) cos 40^(@) +sin 100^(@) sin 40^(@)

Simplify cos 100^(@) cos 40^(@) + sin 100^(@) sin 40^(@) .

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

sin20^(@)*cos40^(@)+cos20^(@)*sin40^(@)=(sqrt(3))/(2)

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