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# Inverse trigonometric functions -cancellation equations watch

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1. 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.
(Maths-c3)
2. 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
3. Ohhh, dont think i was clear never mind,
Thanks anyway

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