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кек436
@кек436
July 2022
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sin 9 cos 99 - sin99 cos9
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zinaidazina
Sin 9° cos 99° - sin99° cos9°
=
= sin 9° cos (90°+9°) - sin(90° +9°) cos9° =
= sin 9° (- sin 9°) - cos9° cos9° =
= - sin² 9° - cos² 9° =
= - (sin² 9° +cos² 9°) = - 1
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Answers & Comments
= sin 9° cos (90°+9°) - sin(90° +9°) cos9° =
= sin 9° (- sin 9°) - cos9° cos9° =
= - sin² 9° - cos² 9° =
= - (sin² 9° +cos² 9°) = - 1