answer plss fast I have exam
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Step-by-step explanation:
cos70°/sin20° +cos59°/sin31° -8sin²30°
=cos70°/sin(90-70)° +cos59°/sin(90-59)° -8sin²30°
=cos70°/cos70° +cos59°/cos59° -8sin²30°
=1+1-8(½)²
=2-8×¼
=2-2
=0
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