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1-cos2theta =...

`1-cos2theta = `

A

`2sin^(2)theta`

B

`2cos^(2)theta`

C

`sin^(2)theta`

D

`2cos^(2)theta`

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • The root of the equation 1-cos theta = sin ""theta /2 are -

    A
    `(npi)/(4)`
    B
    `2npi`
    C
    `npi`
    D
    `(npi)/(2) ` where `n in ZZ`

  • If tan theta =sqrt((3)/(2)), then the sum of infinity of the series, 1+2 (1-cos theta ) + 3 (1-cos theta ) ^(2) +4(1- cos theta )^(3)+… is-

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    `2/3`
    B
    `(sqrt3)/(4)`
    C
    `(5)/(2sqrt2)`
    D
    `5/2`

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