After many years in business,the financial analyst of a shoe company projected that the monthly costs of producing their products and monthly revenues from the sales of their products are fluctuating according to the following formulas:  C(t)=2.6+0.58 sin (0.52t-7.25) R(t)=2.6+1.82 cos(0.52t-7.25) Where C(t) and R(t) are those costs and revenues in million of pesos at month t(t=0 represent January 2010).About how many months after January 2010 did the company experience a zero profit for the first time?

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