Recall that
sin²(<em>θ</em>) + cos²(<em>θ</em>) = 1
for all <em>θ</em>, and given that cos(<em>θ</em>) < 0, we find that
cos(<em>θ</em>) = -√(1 - sin²(<em>θ</em>)) = -√(1 - (2/5)²) = -√(21)/5
Now,
csc(<em>θ</em>) = 1/sin(<em>θ</em>) = 1/(2/5) = 5/2
and
cot(<em>θ</em>) = cos(<em>θ</em>)/sin(<em>θ</em>) = (-√(21)/5)/(2/5) = -√(21)/2
Your answer should be v=0
Your answer is C. -4x - 3 < 13. This is because the step after this then adds the 3 to get -4x < 16, and so the -4x was achieved by doing -x - 3x in the second step. I hope this helps! Let me know if you have any questions :)
Answer:
Step-by-step explanation:
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Step-by-step explanation:
I would say the one that says after eliminating a variable,the result is x=0
cause the zero can change into any number.
