Prove that, using the identity sec²Ф= 1+tan²Ф
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In LHS divide each term by cosФ
then the 1 you get in denominator change it into sec²Ф-tan²Ф
write sec²Ф-tan²Ф in the form of (secФ-tanФ) and (secФ+tanФ)
so on solve it
then the 1 you get in denominator change it into sec²Ф-tan²Ф
write sec²Ф-tan²Ф in the form of (secФ-tanФ) and (secФ+tanФ)
so on solve it
kvnmurty:
u have to do it and show. not just an advice.
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