Question

(1-сos A) (1 + cos A) - tan’A.
(1-sin A) (1 + sin A)​

Answer 1

Answer:

lastly, you can prove the required by

fraction numerator left parenthesis 1 plus sin space straight A right parenthesis over denominator cos space straight A end fraction

equals sec space straight A space plus space tan space straight A

equals fraction numerator open parentheses sec space straight A space plus space tan space straight A close parentheses begin display style open parentheses sec space straight A space minus space tan space straight A close parentheses end style over denominator sec space straight A space minus space tan space straight A end fraction

equals fraction numerator begin display style open parentheses sec squared space straight A space minus space tan squared space straight A close parentheses end style over denominator sec space straight A space minus space tan space straight A end fraction

equals fraction numerator 1 over denominator sec space straight A space minus space tan space straight A end fraction