Question

Cos 4x = 1- 8 sin² x Cos²x
prove​

Answer 1

Answer:

Step-by-step explanation:

cos4x can also be written as cos2(2x)

cos2(2x) =1-2sin2(2x)

            =1-2(2sinx . cosx)2                          { sin2x = 2sinx. cosx}

            =1-2(4sin2x.cos2x)

           =1-8sin2x.cos2x

LHS=RHS

Proved

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Answer 2

1.8sin...mark as brainlist....

Full steps are already given so I not given you full steps.... Target =500 followers