Find the values of sinx and tanx if cosx=4/5 and x is in the first quadrant.
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Draw yourself a right triangle with an unnamed angle . We know the adjacent side is 4 units and the hypotenuse is 5 units.
Okay, then I get sinx= 3/5 and tanx=3/4. Do I take the inverse of these to get my answer?
No, you're done. The question wanted you to find and , indeed the inverses are ghastly numbers.
Alternatively, as Sin(x) is positive in the first quadrant.
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