prove that √2√2+2√2+cosx=2cosx
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answer=.........................1=1
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Answer:
proof -
Step-by-step explanation:
√2+√2+√2+cos8x
=√2+√2+√2(1+cos2(4x)
=√2+√2+√2 x 2cos²4x
=√2+√2+2cos4x
=√2+√2(1+cos2(2x)
=√2+√2 x 2cos²2x
=√2+2cos2x
=√2(1+cos2(x)
√2 x 2cosx
=2cosx
LHS= RHS
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