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(Sec A + tan A -1 …

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(Sec A + tan A -1 ) (Sec A - tan A +1 ) = 2 tan A

Posted by Jashanjot Dhillon 6 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Aviral Goyal 6 years, 3 months ago

Question is wrong lhs=2 not 2tanA

Aadya Singh ? 6 years, 3 months ago

1+2tanA -1 => 2 tanA..

Aadya Singh ? 6 years, 3 months ago

LHS - (SecA)^2 - (tanA-1)^2
Sec^2A - (tan^2 - 2tanA+ 1)
Sec^2A - tan^2A + 2tanA - 1
1+2tanA -1
Now, LHS = RHS. So, it's prove..

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