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sin A+ sin 3A+ sin 5A + sin 7A=...

`sin A+ sin 3A+ sin 5A + sin 7A=`

A

`4 sin A cos 2A cos 4A `

B

`4 cos A sin 2A sin 4A `

C

`4 cos A cos 2A sin 4A `

D

`4 sin A cos 2A cos 4A `

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • ( sin 4 A sin 3A - sin 5A sin 2A+ sin 7A sin 4A )/(cos 2A cos 3A - cos 2A * cos 7A + cos A * cos 10A )=

    A
    `tan4 A * tan 5A `
    B
    `tan 5A * tan 6A `
    C
    `tan 4A * tan 6A `
    D
    `tan 5A * tan 2A `

  • ( sin 3A + sin A) sin A + ( cos 3A- cos A ) cos A =

    A
    0
    B
    1
    C
    2
    D
    3

  • In Delta ABC, if (sin A+sin B+sin C) (sin A+ sin B- sin C)=3 sin A sin B , then

    A
    `A=60^@`
    B
    `B=60^@`
    C
    `C=60^@`
    D
    None

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