Math, asked by Anonymous, 10 months ago

hello everyone!!.....

plz help me

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Answered by Anonymous

73

Answer:

Step-by-step explanation:

I = tanФ + secФ

I - secФ = tanФ

l² + sec²Ф - 2 l secФ = tan²Ф

= sec²Ф - 1

So secФ = (l² + 1) / 2l

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