Cos(x)= 40/41 and x lies in Q4. Find sin(x)
2 answers:
Answer:
sinx =-9/41
Step-by-step explanation:
cos x= adjacent/hypotenuse = 40/41
sin x = opposite/ hypotenuse = x/41
how do we find o? pythagorean theorem
o²=41² -40²
0= + or - 9
Now is 9 negative or positive?
well since the graph is in quadrant 4, according to CAST Rule, Sin will always be negative
therefore o =-9
sinx = -9/41
Step-by-step explanation:



sin(x)=±9/41
As x lies in Quadrant 4 , sin(x) = -9/41
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