Question

Cos²56 + cos²34/sin²56 +sin²34 +3tan²56 tan²34=?

Answer 1

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