Math, asked by mahatosabita996, 3 months ago

sin A+sin 3A
cos3A + COSA

Answers

Answered by Venu1442005

6

Step-by-step explanation:

sinA+sin3A

=

2cos(

2

3A+A

)cos(

2

3A−A

)

2sin(

2

3A+A

)cos(

2

3A−A

)

=

cos4AcosA

sin2AcosA

=tan2A=R.H.S.

Ans: 2

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