sec B + tan B = P
then 1/p ?
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1/P = 1 / (SecB + TanB)
= 1 / (1/CosB + SinB/CosB)
= 1 / (1+SinB / CosB)
= CosB / 1+SinB
= 1 / (1/CosB + SinB/CosB)
= 1 / (1+SinB / CosB)
= CosB / 1+SinB
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