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[" 25."(cos12^(@)-sin12^(@))/(cos12^(@)+...

[" 25."(cos12^(@)-sin12^(@))/(cos12^(@)+sin12^(@))+(sin147^(@))/(cos147^(@))=],[[" (2) "1],[" (c) "0]]

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(cos 12^(@) - sin 12^(@))/(cos 12^(@) + sin 12) + (sin 147^(@))/(cos 147^(@))=

(cos 12^(@) - sin 12^(@))/(cos 12^(@) + sin 12) + (sin 147^(@))/(cos 147^(@))= ................... A) 1 B) -1 C) 0 D) sqrt3

(sin9^(@)-cos9^(@))/(sin48^(@)sin 12^(@))=

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Evaluate cos 12^(@) -sin 78^(@)

Evaluate cos 12^(@) -sin 78^(@)

Evaluate cos 12^(@) -sin 78^(@)

Evaluate cos 12^(@) -sin 78^(@)