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(i) If x=(11pi)/(4), prove that: "sin...

(i) If `x=(11pi)/(4)`, prove that:
`"sin"^(2)x-cos^(2)x+2"tan"x-sec^(2)x=-4`.
(ii) If 8`theta=pi`, prove that cos `theta+cos7theta=0`
(iii)If B+C=`60^(@)`, show that: `"sin"(120^(@)-B)="sin"(120^(@)-C)`.

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