prove that ➡(sin35/cos55)²+[cos55/sin35]²-2cos60=1
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Step-by-step explanation:
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Step-by-step explanation:
(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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