Sol=d/dx cos²(?3 x)
=applying power rule
=2cos²·¹(?3 x)d/dx (cos?3 x)
=2cos(?3 x
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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