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cos70^(@)*cos20^(@)-sin70^(@)*sin20^(@)=...

cos70^(@)*cos20^(@)-sin70^(@)*sin20^(@)=

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Show that: cos70^(@)*cos10^(0)+sin70^(@)*sin10^(@)=(1)/(2)

Evaluate the following: cos80^(@)cos20^(@)+sin80^(@)sin20^(@)

The value of (sin 20^(@)cos70^(@)+ cos20^(@)sin70^(@))/(sin23^(@)"cosec"23^(@)+cos23^(@)sec23^(@)) is _________.

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

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

(cos20^(@)+8sin10^(@)sin50^(@)sin70^(@))/(sin^(2)80^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=?