# formula tan2xWatch

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#21
(Original post by TenOfThem)
-180<x<180

if sinx>0 then x is limited to 0<x<180

tanx can be either since it is +ve in 1st quadrant and -ve in the 2nd
right so if sinx=3/5 will tan be positive or negative? or would u mean either solutions we can get
0
6 years ago
#22
(Original post by otrivine)
right so if sinx=3/5 will tan be positive or negative? or would u mean either solutions we can get
either

0<x<90 sinx>0 and tanx>0

90<x<180 sinx>0 but tanx<0
0
#23
(Original post by TenOfThem)
either

0<x<90 sinx>0 and tanx>0

90<x<180 sinx>0 but tanx<0
In the exam will they tell us this information or not like if we have 2 solutions? do u think this range is common to ask
0
6 years ago
#24
(Original post by otrivine)
In the exam will they tell us this information or not like if we have 2 solutions? do u think this range is common to ask
It really depends on the question

Most questions will limit x in such a way that the function to be found would be either +ve or -ve not both
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#25
(Original post by TenOfThem)
It really depends on the question

Most questions will limit x in such a way that the function to be found would be either +ve or -ve not both
thank you!!
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