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Inverse trigonometric functions -cancellation equations watch

    • Thread Starter

    Hi, can someone help with my q.
    F(x) = 13-6x ÷7
    F^-1(x) = 13-7x ÷6
    Show that ff^-1(x) = f^-1f(x) = x.

    The part i need help with is the ff^-1(x), i know this has something to do with it cancelling out but i jus cant remember exactly what you do.

    To work out the inverse of an equation (I think this is what you are asking)
    1) swap f(x) with y
    2) switch y with x (so put a y where the x was and a x where the y was)
    3) rearrange the equation to make it equal y once again
    4) swap f^-1(x) with y
    • Thread Starter

    Ohhh, dont think i was clear never mind,
    Thanks anyway
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