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Sol=d/dx cos²(√3 x)
=applying power rule
=2cos²·¹(√3 x)d/dx (cos√3 x)
=2cos(√3 x) (-sin(√3 x))d/dx(√3 x)
= -2cos(√3 x)(sin(√3 x)(√3)
{ -2√3cos(√3 x)(sin(√3 x)} ans
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