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Verify only working with one side:
cos^2x + tan^2x cos^2x = 1

  • Precalculus -

    tan^x*cos^2x can be replaced with sin^2x, since tan^2x = sin^2x/cos^2x

    cos^2 + sin^2x = 1


  • Precalculus -

    Thank you.!

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