help@askiitians.com

1800-150-456-789

Trigonometry> solve if u can...

question mark

(sinA)x²+2(cosA)x+(cosA+sinA)½

if this is a square of linear fn FIND GENRL VALUS FR A

sumit kadam , 12 Years ago

Grade 11

1 Answers

Jitender Singh

Last Activity: 10 Years ago

Ans:

$f(x) = (sinA)x^{2}+(cosA)(2x)+(cosA+sinA)^{1/2}$

$f(x) \rightarrow (x+1)^{2}$

$sinA =1$ ...(1)

$cosA =1$ ….(2)

$(cosA+sinA)^{1/2} =1$ …..(3)

From (1)

$A = n\pi + \pi /2$

From (2)

$A = n\pi$

From(3)

$cosA+sinA = 1$

$(2)^{1/2}sin(A+\pi /4) = 1$

$sin(A+\pi /4) = \frac{1}{2^{1/2}}$

$A + \pi /4 = n\pi + \pi /4$

$A = n\pi$

There is not any intersection between solution ot (1), (2) and (3)

A is an null set.

Thanks & Regards

Jitender Singh

IIT Delhi

askIITians Faculty

Provide a better Answer & Earn Cool Goodies

LIVE ONLINE CLASSES

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

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

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: 2 Years ago

Find the general solution of equation tan3∂=cot2∂
For all angles between -720 and +720

trigonometry

0 Answer Available

Last Activity: 3 Years ago

To prove : Cosec(45 degree - A)Cosec(45 degree + A) = 2SecA

trigonometry

0 Answer Available

Last Activity: 3 Years ago

cos^2 13ºcos^2 47º+cos^2 73º =? …..................

trigonometry

0 Answer Available

Last Activity: 3 Years ago

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

trigonometry

0 Answer Available

Last Activity: 3 Years ago

View all Questions