Question

(1+cosA)^2+(1-cosA)^2/sin^2A=2(1+2cot^2A)

Answer 1

Answer:

Starting with the LHS, the sum would be

1

+

cos

A

+

1

−

cos

A

(

1

+

cos

A

)

(

1

−

cos

A

)

=

2

1

−

cos

2

A

=

2

sin

2

A

=

2

csc

2

A

=

2

(

1

+

cot

2

A

)

=

2

+

2

cot

2

A