Question

1 point
24. If 2 sin’ A -cot B=1 then sin A sin B =​

Answer 1

Answer:

$ANSWER</p><p> \\ </p><p>In ΔABC, 2sinCcosA=sinB        [given] \\ </p><p>⇒sin(C+A)+sin(C−A)=sinB</p><p> \\                             [∵2sinAcosB=sin(A+B)+sin(A−B)] \\ </p><p> \\ ⇒sin(180o−B)+sin(C−A)=sinB</p><p>                      \\  [∵∠A+∠B+∠C=180o]</p><p> \\ ⇒sinB+sin(C−A)=sinB</p><p>⇒sin(C−A)=0=sin0o \\ </p><p>⇒C−A=0 \\ </p><p>⇒C=A</p><p></p><p>$

Answer 2

Step-by-step explanation:

An associative property can not hold for subtraction of whole numbers.