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Question

Prove that: whole root(secA-tanA/ secA+tanA) X whole root(cossecA-cotA/ cossecA+tanA) = (secA-1) (cosseA-1)

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Solution

Dear student
secA-tanAsecA+tanA×cosecA-cotAcosecA+cotA=secA-tanAsecA+tanA×secA-tanAsecA-tanA×cosecA-cotAcosecA+cotA×cosecA-cotAcosecA-cotA=secA-tanAsec2A-tan2A×cosecA-cotAcosec2A-cot2A=secA-tanA1×cosecA-cotA1=secA-tanAcosecA-cotA=secA cosecA-secA cotA-tanA cosecA+tanA cotA=secA cosecA-cosecA-secA+1=secAcosecA-1-1cosecA-1=secA-1cosecA-1
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