the question is:
find the exact value of
sin(x-y) when sinx=8/17 and cos=5/13
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Use the formula .
Originally Posted by red_dog Use the formula . but you only have sinx and cosy you dont have siny and cosx
To choose the sign before the radical, you have to know in which quadrant are x and y.
i wasnt taught the radical yet, is there another way like guess and check?
Originally Posted by pogiphilip i wasnt taught the radical yet, is there another way like guess and check? Hi
Do you know the domain for x and y ? ie 0<x<90 ??
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