Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 120 off


If 3 sin2 A + 2 sin2 B = 1 and 3 sin 2A − 2 sin 2B = 0, where A and B are acute angles then find the value of (A +2B)

5 years ago


Answers : (1)


Dear Nirabhra, 

sin2B=3/2sin2A …(i)

And from the first equation,

3sin2A=1-2sin2B=cos2B …(ii)

cos (A + 2B) = cos A. cos 2B – sin A.sin 2B


3cosA.sin2A-3sin2AcosA =0

cos (A+2B)=0

∴ A+2B=π2,3π2 …(iii)

Given that < A < π/2 and 0 < B < π/2

⇒ 0<A+2B<π+π2

⇒ 0<A+2B<3π2 …(iv)

From (iii) and (iv),



Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..


Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

5 years ago

Post Your Answer

min value valvue of 3^(sin^6 x) + 3^(cos^6 x)
Hint: Apply the condition that for two numbers, A.M. (Arithmetic mean) is always greater then or equal to their G.M. (Geometric Mean). Thanks.
Vijay Mukati 10 months ago
2*3 1/4
nikesh 10 months ago
sin θ=cosθ then θ=?
sin θ=cosθ*1 sinθ/cosθ=1 tan θ=1 tanθ=tan45 θ=45
RAJU 8 months ago
45 degrees
kalyan 8 months ago
45 Degrees
SAIMANIKANTA 8 months ago
SEELA YUVARAJU 8 months ago
SAI SARDAR 8 months ago
What is the parallelogram law of two vectors and what is definations of dot product and cross product
Acccording to the parallelogram law of vector addition: "If two vector quantities are represented by two adjacent sides or a parallelogram. then the diagonal of parallelogram will be equal...
KALYAN 5 months ago
In mathematics, the dot product or scalar product (sometimes inner product in the context of Euclidean space, or rarely projection productfor emphasizing the geometric significance), is an...
Gaddam Chethan 5 months ago
HELLO PRABHAKAR parallelogram law of vector addition states that when two vectors are represented by two adjacent sides of a parallelogram by direction and magnitude then the resulatant of...
raj kumar 4 months ago
Solve this reasoing question nd send me the image...
You have not uploaded the question here, please check and resend. Thanks.
Vijay Mukati 2 months ago
What is fibonachi sequence? give one example. who was discovered this sequence?
The Fibonacci sequence is a series of numbers where a number is found by adding up the two numbers before it. Starting with 0 and 1, the sequence goes 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and...
KALYAN 5 months ago
Mr Sivagiri Guravaiah Fibonacci sequence is the series of numbers this is useful in many real applications in the series the number is found by adding before two numbers...
Prabhakar ch 5 months ago
Hello GUravaiah The Fibonacci Sequence is the series of numbers : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... The next number is found by adding up the two numbers before it. The 2 is found by...
Gaddam Chethan 4 months ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 6,000 off
USE CODE: int40

Get extra R 120 off

More Questions On Trigonometry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details