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Question : 21 of 160
Marks:
+1,
-0
Solution:
Consider the function.
cos‌‌cos‌‌cos‌‌cos‌ cos‌‌cos‌=x It is solved as,
cos‌‌cos‌‌cos‌‌cos‌ =2x cos‌‌cos‌‌cos‌‌cos(π−) =2x −cos‌‌cos‌‌cos‌22‌‌cos‌23‌ =2x −=2x Thus,
2x=− 2x=− 2x=− 2x= Hence,
x= =32 =4
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