question

Asked by arindeep.singh | 20th Aug, 2020, 06:56: PM

Expert Answer:

sin2A = 2sinA
→ 2sinAcosA = 2sinA
2sinAcosA - 2sinA = 0
2sinA(cosA - 1) = 0
2sinA  = 0 or (cosA - 1) = 0
  sinA  = 0 or cos A= 1
→     A  =  or A =
 
Hence, it is proved that sin2A = 2sinA when A =


 

Answered by Yasmeen Khan | 20th Aug, 2020, 10:27: PM