The Total solution for NCERT class 6-12
Answer - 21 : -
Let ex = t ⇒ ex dx = dt
Substituting t =1 and t = 0 in equation (1), we obtain
A =−1 and B = 1
Answer - 22 : -
Substituting x =1 and 2 in (1), we obtain
A =−1 and B = 2
Hence, the correct answeris B.
Answer - 23 : -
Equating the coefficientsof x2, x, and constant term, we obtain
A + B =0
C = 0
A = 1
On solving theseequations, we obtain
Hence, the correct answeris A.