Write the value of cos 2Q-1uponsin2Q
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cos²∅-1/sin²∅
using sin²∅+cos²∅=1
cos²∅-1=-sin²∅
therefore -sin²∅/sin²∅
=-1
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using sin²∅+cos²∅=1
cos²∅-1=-sin²∅
therefore -sin²∅/sin²∅
=-1
plzz mark as brainliest
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