Question

(sin35/cos55)²+(cos43/sin47)-2cos60​

Answer 1

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

Answer 2

ok

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