Question

show that 1- tan A/1+tanA
= 2 cos A-1.​

Answer 1

Answer:

MATHS

Prove that

secA+tanA

1

−

cosA

1

=

cosA

1

−

secA−tanA

1

December 20, 2019avatar

Rubee Dayal

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ANSWER

According to question,

secA+tanA

1

−

cosA

1

=

cosA

1

−

secA−tanA

1

⟹

secA+tanA

1

+

secA−tanA

1

=2secA

Solving LHS,