Cos²56 + cos²34/sin²56 +sin²34 +3tan²56 tan²34=?
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Answer:
cos²(90-34)+cos²34
________________+3tan²(90-34)×
sin²(90-34)+sin²34 tan²34
sin²34+cos²34
___________+3×cot²34×tan²34
sin²34+cos²34
1+3×1/tan²34×tan²34
1+3
=4
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