plz tell me solution plz tell solution
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the formula is
sin(90-angle)=cos angle
so
sin(90-78)=cos12°
sin(90-18)°=cos72°
so
cos 12°-cos72°+cos 132°
=-60+132°
=cos 72°
hope its right☺
sin(90-angle)=cos angle
so
sin(90-78)=cos12°
sin(90-18)°=cos72°
so
cos 12°-cos72°+cos 132°
=-60+132°
=cos 72°
hope its right☺
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