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B
eln∣∣∣π4∣∣∣
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C
e12ln⎛⎜⎝π216⎞⎟⎠
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D
Period of y=cos4x
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Solution
The correct options are Aeln
⎷π24 D Period of y=cos4x Let us draw the graph of y=sin4x We can observe from the graph that the graph is repeated after every interval of length π2. ∴ Period of sin4x is π2
(iv) Let us draw the graph of y=cos4x We can observe from the graph that the graph is repeated after every interval of length π2. ∴ Period of cos4x is π2