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Prove that : (i) sin42^(@)cos48^(@)+si...

Prove that : (i) `sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1`
(ii)`cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0`

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sin48^(@)sec42^(@)+cos48^(@)csc42^(@)=

sin42^(@)sec48^(@)+cos42^(@)cos ec48^(@)=2

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

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

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

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

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

Show that: sin 42^(@)sec 48^(@)+cos 42^(@)cosec 48^(@)=2

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2