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Prove (i)cos(A+B)+cos(A-B)=2cosAcosB (ii...

Prove `(i)cos(A+B)+cos(A-B)=2cosAcosB` (ii)`cos(A-B)-cos(A+B)=2sinAsinB`

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Knowledge Check

  • cos^(2)(A-B)+cos^(2)B-2cos(A-B).cosA.cosB=?

    A
    `cos^(2)A`
    B
    `sin^(2)A`
    C
    `tan^(2)A`
    D
    `cot^(2)A`

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