1.

Prove that Tan²A Sec²B -Tan²B Sec²A = tan²A-tan²B

Answer»

Step-by-step EXPLANATION:

RHS =tan²Asec²B-tan²Bsec²A

=tan²A(1-tan²B)-tan²B(1-tan²A)

=tan²A-tan²Atan²B-tan²B+tan²Atan²B

=tan²A-tan²B



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