+91-705-589-3577
FlagBACK
Flag Trigonometry> please please answer this question if tan...
question mark

please please answer this question if tan alpha =√a where a is rational number which is not a perfect square then which of the following is rational number
a.sin2 alpha
b.tan2 alpha
c.cos2 alpha
d.cot alpha

SanchiSSonawane , 7 Years ago
Grade 11
anser 2 Answers
Arun
cos 2 alpha = 1 – tan^2 alpha / 1 + tan^2 alpha
 
 = 1 – a / 1+a
 
Hence a rational number
 
So option 3 is correct
ApprovedApproved
Last Activity: 7 Years ago
yathartha gupta
Cot alp
ApprovedApproved
Last Activity: 7 Years ago
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on trigonometry

question mark
In ABC, if cot A+cot B+cot C = cosecA cosecB cosecC, then prove that ABC is right angle triangle.
trigonometry
1 Answer Available

Last Activity: 3 Years ago

question mark
  • Find the general solution of equation tan3∂=cot2∂
For all angles between -720 and +720
trigonometry
1 Answer Available

Last Activity: 3 Years ago

question mark
To prove : Cosec(45 degree - A)Cosec(45 degree + A) = 2SecA
trigonometry
1 Answer Available

Last Activity: 3 Years ago

question mark
Derive a formula for the area of the triangle, given b, A, B, and C. That is, derive the formula: (b^2sinAsinC)/(2sinB)
trigonometry
1 Answer Available

Last Activity: 3 Years ago

question mark
WHAT IS THE LIMIT WHEN X TOWARDS TO 0 OF sin6x/5x ? lim𝑥→0 𝑠𝑖𝑛6𝑥/5𝑥 
trigonometry
1 Answer Available

Last Activity: 3 Years ago