Question/Answer If A1 A2 A3 A4 are the coefficients of any four consecutive terms in the expansion of (1+x)^n prove that (A1/A1+A2)+(A3/A3+A4)=2A2/A2+A3. February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer If A+B=45 prove that (cot A-1)(cot B-1)=2. February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer The 2nd 3rd and 4th terms in the expansion of (x+a)^n are 240 720 and 1080 respectively. Find the values of x a and n. February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Show that the co-efficient of x^n in (1+x)^2n is twice the co-efficient of x^n in (1+x)^2n-1. February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer If x-iy=Root(a-ib/c-id) prove that x^2+y^2=Root(a^2+b^2/c^2+d^2) February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Prove that : (sin^2)A=(cos^2)(A-B)+(cos^2)B-2cos(A-B)cos A cos B February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Prove that : sin (2n+1) A . sin A=(sin^2)(n+1) A-(sin^2)nA February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Prove that : (cos^2)2x-(cos^2)6x=sin4x sin8x February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Prove that : (sin^2)6x-(sin^2)4x=sin2x sin10x February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)

Question/Answer Prove that : tan 50=tan 40+2 tan 10. February 21, 2018 Bhupender Sachdeva Leave a comment Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)