Math, asked by jamesedamana13, 4 months ago

show that cos3A + cos5A + cos9A+cos17A= cos4A× cos6A× cos7A?​

Answers

Answered by varsha5160
1

Answer:

prove that cos 3A +cos 5A + cos7A + cos 15A = 4cos4Acos5Acos6A.

114 votes

2cos[5A+3A/2]cos[5A-3A/2]+2cos[15A+7A/2]cos[15A-7A/2]=2cos4AcosA+2cos11Acos4A=2cos4A[cosA+cos11

jamesedamana13: its not clear
varsha5160: ok thanks for telling this
jamesedamana13: plz clear this answer
varsha5160: ok
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