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Venkatesh
Questions (9)
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
2 answers
326 views
2sin^2 A + 5cosA = 4 , Prove that cos A = 1/2
1 answer
592 views
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
3 answers
577 views
x×sin^3A=y , cos^3A = sinA × cosA , x×sinA= y×cosA , then prove that x^2+ y^2= 1
I have no idea
2 answers
946 views
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
3 answers
806 views
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
3 answers
537 views
tanA - sin A /sin^2A= tan A / 1 + cosA
Please prove this
4 answers
3,697 views
In an AP , Sn = 2n , S2n = n Find S4n
1 answer
408 views
sum of 4 terms of g p is 30 & sum of first and last term is 18 . Find gp
2 answers
385 views
Answers (9)
How please explain i am beginner to this type problems
How please explain
I got the answer
Good effort But answer is wrong 540 minutes= 9 hours 9×65 = 585 581 is answer
Take LCM of 14 and 8 That is 56 . After 56 days they will fill tank again Hope you understand Comment it
Make achievement
Thanks reiny sir
Please give the answer in lengthy way and full maths but sir you solved this logic
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)
