Venkatesh

Most popular questions and responses by Venkatesh
1. trigonometry

tanA - sin A /sin^2A= tan A / 1 + cosA Please prove this

2. trigonometry

x×sin^3A=y , cos^3A = sinA × cosA , x×sinA= y×cosA , then prove that x^2+ y^2= 1 I have no idea

3. trigonometry

2sin^2 A + 5cosA = 4 , Prove that cos A = 1/2

4. Combination

In a question paper there are two parts A and B . Part A contains 6 questions and part B contains 7 questions . in how many ways a student can select 4 questions in part A of which 2 questions are compulsory and 5 questions in part B of which 3 questions

5. Arithmetic progression

In an AP , Sn = 2n , S2n = n Find S4n

6. Geometric progression

sum of 4 terms of g p is 30 & sum of first and last term is 18 . Find gp a(r^4-1)/(r-1) = 30 a + ar^3 = 18 a(1+r^3) = 18 it's easy to see that if a=2, r=2 Does that work on S4? 2*15/1 = 30. Yes So, the GP is 2,4,8,16,... But sir I want not logic proof ,

7. MATHS GP

IN A GP if the sum of 2nd and 4th terms is 30 . The difference of 6th and 2nd term is 90 . Find the 8 the term I got r = √13/2 Is it correct? Pls answer

8. math

Average of 4 dates marked in calender 4,5,6,10 how do u write method wise

9. math

sum of 4 terms of g p is 30 & sum of first and last term is 18 . Find gp

10. Progression

if a , b ,c are in AP x , y , z are in GP . Prove that (x^b/x^c)× (y^c/y^a)× (z^a/z^b)=1

1. Science

Clinical thermometers have a kink but laboratory thermometers have a wide range

posted on September 13, 2017
2. Weather & Climate (science)

Barometer

posted on September 13, 2017
3. Bps science

Yes it's right after electrolysis hydrogen and oxygen become separate and everybody will call it as a physicalchange but it's wrong when it's vaporised hydrogen becomes H2 oxygen becomes O2 it can't be formed as water again so it's a chemical change

posted on September 13, 2017
4. Progression

How please explain i am beginner to this type problems

posted on March 27, 2016
5. Combination

posted on March 24, 2016
6. MATHS GP

posted on March 23, 2016
7. Math

Good effort But answer is wrong 540 minutes= 9 hours 9×65 = 585 581 is answer

posted on March 23, 2016
8. Maths

Take LCM of 14 and 8 That is 56 . After 56 days they will fill tank again Hope you understand Comment it

posted on March 23, 2016

Make achievement

posted on March 23, 2016
10. trigonometry

Thanks reiny sir

posted on March 23, 2016
11. math

Please give the answer in lengthy way and full maths but sir you solved this logic

posted on March 22, 2016
12. maths-TRIGNOMETRY

1/32(cos6a-cos2a-2cos4a+2) let us find the value of cos6a-cos2a-2cos4a+2 by applying the formula cos c-cos d = 2sin(c+d/2)sin(d-c/2) =2sin4a(sin(-2a)-2cos4a+2 =-2sin4asin2a-2cos4a+2 =2(1-cos4a-sin4asin2a)

posted on May 19, 2013
13. physics

1m+(2*0.95m)+(2*0.9m)+(2*0.8m)+...+(2*.05m)+0 2m (2000cm)

posted on December 22, 2011