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(sin35/cos55)²+(cos43/sin47)-2cos60 |
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Answer» ONG>Answer: (sin35/cos55)²+(cos55/sin35)²-2cos60 =[COS(90-35)/cos55]²+[cos55cos(90-35)]²-2cos60 =(cos55/cos 55)²+(cos55/cos 55)²-2cos60 =1+1-2×1\2 =1+1-1 =1
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