Question

Let f(x) = cos2x cos4x cos8x cos10x and M = lim_(x→0) ((1 – (f(x))³)/5tan²x), where M is finite, find the value of (√(M – 2) + 1) 

Answer 1

We have

M = lim_(x→0) ((1 – (f(x))³)/5tan²x)

Hence, the value of (√(M – 2) + 1)

= √(66 – 2) + 1 = 8 + 1 = 9