Hi

Please have a look on the attachment and kindly help me with queries there. I'm sorry if answer to any of the queries is obvious. Right now, I'm very much exhausted and time-constrained. Thank you.

Regards
PG

 

Q2: this is basic algebra:

start from
B(A*CxD) - A(B*CxD) = C(A*BxD) - D(A*BxC)

move the last term to the left (changes sign):
D(A*BxC) + B(A*CxD) - A(B*CxD) = C(A*BxD)

move second and third term to the right (they both change sign):
D(A*BxC) = -B(A*CxD) + A(B*CxD) + C(A*BxD)

reorder second and third term:
D(A*BxC) = A(B*CxD) - B(A*CxD) + C(A*BxD)

finally divide everything by bracket on the left in order to free D:
D(A*BxC)/(A*BxC) = [A(B*CxD) - B(A*CxD) + C(A*BxD)]/(A*BxC)

note (A*BxC)/(A*BxC) = 1

so we get

D*1 = [A(B*CxD) - B(A*CxD) + C(A*BxD)]/(A*BxC)
or
D= A(B*CxD)/(A*BxC) - B(A*CxD)/(A*BxC) + C(A*BxD)/(A*BxC)

 

Thank you, panic mode, and sorry I have been little late with my thanks. Actually I was very much busy till yesterday.

Regards
PG