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## Answers

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

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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