cos A+cos2 A=1 , Then sin2A+Sin4A=?
cos A+cos2 A=1 , Then sin2A+Sin4A=?
nileena , 11 Years ago
Grade
Trigonometry> cos A+cos 2 A=1 , Then sin 2 A+Sin 4 A=?...
1 AnswersY RAJYALAKSHMI
cosA + cos2A = 1 => cos2A = 1 – cosA
=> sin2A = 1 – cos2A = 1 – (1 – cosA) = cosA
Now, sin2A + sin4A = sin2A (1 + sin2A) = cosA ( 1 + cosA) = cosA + cos2A = 1
Ans: 1
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