Math, asked by dineshnayak, 1 year ago

plz tell me solution plz tell solution

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Answered by shreya32457

0

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☺

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