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March 30, 2017

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Eight Fundamental Identities

Sec thada - Cos thada

How do I do this?

  • Meaning what? - ,

    There is no equal sign so no identity.
    sec t = 1/cos t
    by definition if that helps

  • Trig - ,

    sec ( theta ) = 1 / cos ( theta )


    sec ( theta ) - cos( theta ) =

    [ 1 / cos ( theta ) ] - cos ( theta ) =

    [ 1 - cos ^ 2 ( theta )] / cos ( theta ) =

    sin ^ 2 ( theta) / cos ( theta ) =

    sin ( theta ) * sin ( theta ) / cos ( theta ) =

    [ sin ( theta ) / cos ( theta ) ] * sin ( theta ) =

    tan ( theta ) * sin ( theta )

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