Venkatesh

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

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

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

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 , p...

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...

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

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

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

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

1/32(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) =2(cos^2(2a)+sin^2(2a)-(cos^2(2a)-sin^2(2a))-2sin2...

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

Thanks reiny sir

Make achievement

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

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

I got the answer

How please explain

How please explain i am beginner to this type problems