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Trigonometry

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How am I suppose to transform the left side of the equation into the right side using trig identities? ):

1) sin^2θ - cos^2θ = 2 sin^2θ - 1

  • Trigonometry -

    sin^2x + cos^2x = 1
    from the above,we make cos^2x the subject of the formula:
    cos^2x = 1- sin^2x......................(1)
    substituting the above into the left hand side of original equation:

    sin^2x - ( 1 - sin^2x )
    expanding the bracket and noting that - times - equals +
    sin^2x - 1 + sin^2x
    rearranging:
    2sin^2x - 1.

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