pz pz pz pz pz ans prove cos 6x = 32 cos6 x - 48cos4 x + 18 cos2x - 1
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0
cos theory ans 4 x plus 18
Answered by
5
Step-by-step explanation:
Using,
cos2x=2cos
2
x−1
cos3x=4cos
3
x−3cosx
LHS:
cos6x=2cos
2
3x−1
=2(4cos
3
x−3cosx)
2
−1
=2(16cos
6
x+9cos
2
x−24cos
4
x)−1
=32cos
6
x−48cos
4
x+18cos
2
x−1 = RHS
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