prove that : sec²A(1-sin²A)-tan²A=sec²A
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LHS = sec²A (1 - sin²A) - tan²A
= sec²A (cos²A) - tan²A
= sec²A/sec²A - tan²A
= 1 - tan²A = - sec²A
RHS = sec²A
so, they are not equal
may be question is mistake.
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not equal
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