Math, asked by rprusty9692, 8 hours ago

prough that cosA=1-tan²A/2/1+tan²A/2.

Answers

Answered by kpsavani1

0

Answer:

I can't understand

sorry

Answered by devilgamer236891

0

Answer:

LHS=

(1+tan

2

A)

2

tanA

+

(1+cot

2

A)

2

cotA

(sec

2

A)

2

tanA

+

(cosec

2

A)

2

cotA

=

cos

4

A

1

cosA

sinA

+

sin

4

A

1

sinA

cosA

=sinAcos

3

A+cosAsin

3

A

=sinAcosA[sin

2

A+cos

2

A]

=sinAcosA=RHS

Hence proved.

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