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Prove the following (i)sinA*cosA(tanA+c...

Prove the following
`(i)sinA*cosA(tanA+cotA)=1`
`(ii)Sinalpha*cosalpha(tanalpha-cotalpha)=2Sin^2alpha-1`

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  • (a+2)sinalpha(2a-1)cosalpha=(2a+1)if tanalpha is

    A
    `3//4`
    B
    `4//3`
    C
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    D
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