Q)Direction cosines of 2 lines are connected by the relation:-al+bm+cn=0 & fmn+gnl+hlm=0.Find the condition that these 2 lines will be (a)perpendicular (b)parellel
                   

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There is a point inside an equilateral triangle which is at a distance 1,2 and 3 from three sides . the area of triangle ________
 
 
Assume triangle to be ABC and point inside be P.Let each side be''a''.ar(ABC) = ar9PAB) +ar(PBC) + ar(PAC)Root3*a^2/4=1/2*a*1+1/2*a*2+1/2*a*3Get a and then the area. Vinti SinghaiaskIITians...
 
Vinti Singhai 8 months ago
find the sum of all the natural numbers between 1 and 200 which are neither divisible by 2 nor5
 
 
sum of odd terms from 1to 199 number of terms is =100 (tn=a +(n-1)d)a=1;d=2;tn=199 Sn(odd)=n/2[a+l]=50*200=10000 now deduct the term which are multiples of 5 a=5 d=10 tn=>195=5+(n-1)10...
 
gajanana hegde one year ago
 
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srinivas aytha one year ago
Find the equation of circle passing through (3, -6) and touching both the axes ? (a) x 2 + y 2 – 6x + 6y +9 =0 (b) x 2 + y 2 + 6x – 6y +9 =0 (c) x 2 + y 2 – 30x + 30y + 225 =0 (d) x 2 + y 2...
 
 
solution: ans: “a” and “ c” both AS given circle is touching both the axis and passing through (3, -6) so its clear that circle would be in 4 th quadrant .. so the...
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Ajay Verma 3 days ago
Find the value of cos 75
 
 
cos75=cos(90-15)=sin15 sin^@=(1-cos(2@))/2 sin^15=(1-cos30)/2 =(1-(sqrt(3))/2)/2 =(2-sqrt3)/4 sin15=sqrt(2-sqrt3)/2 hence cos75=sqrt(2-sqrt3)/2 Ans. Thanks & Regards Rinkoo Gupta...
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Rinkoo Gupta 2 months ago
 
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Manas Satish Bedmutha 2 months ago
if f(x)=integration of sin(vt)dt,from x² to( 1÷x²),then find the value of f`(1)
 
 
Sher Mohammad B.tech, IIT Delhi
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Sher Mohammad 4 months ago
(2x+3y) is divisible by 17,then for what value of k; (9x+ky) is divisible by 17. Please give the solution.
 
 
gcd(2x+ 3y, 9x + ky ) = 17 or gcd(2x + 3y, (9x + ky) - 4(2x + 3y)) = 17 or gcd(2x + 3y, (x + (k-12) y) = 17 gcd ( 2x+ 3y - 2(x + k- 12y), (x + (k-12) y)) = 17 so 27y -2k y is divisible by 17...
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Sher Mohammad 2 months ago
 
Please reply fast
 
Shrey 3 months ago
 
4(2x+3y)+(9x+5y) = 17(x+y). Since RHS is divisible by 17, and so is 4(2x+3y), we must have 9x+5y also divisible. Hence for any k such that k = 5+19m for any integer m, we have 9x+ky...
 
mycroft holmes 3 months ago
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