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# Negative value vs 1st quadrant

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Hi friends,

I trust you are all doing well...Is the following a typo, or am I missing something?

I have:

$$\sqrt{13}Sinx+3=0$$

They mention that X{0;90}..that means 1st quadrant, however calculating for Sinx we see it's negative? We need to calculate Tanx.

So, $$Sinx=- {3 \over \sqrt13}$$

with the opposite side = -3 and hypoteneuse $$\sqrt13$$

Apr 20, 2023

#1
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x = 2 π n - sin^(-1)(3/sqrt(13)) and n element Z

x = 2 π n + π + sin^(-1)(3/sqrt(13)) and n element Z

Hi juriemagic: I entered your question into "WolframAlpha" calculating engine and it gave me the above 2 answers. They give step by step solution but you have to subscribe to it in order to be able to see them. I think it costs about \$65 US per year.

P.S. They generally use "radians" instead of "degrees" in solving Trig problems.

Apr 20, 2023
#2
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Thank you guest,

I'll check that out..stay blessed..

juriemagic  Apr 20, 2023
#3
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Its a typo   x is in the 3rd or 4th quad

Apr 22, 2023