Write the value of cos $1^{o}$ cos $2^{o}$ .... cos $180^{o}$ .

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Solution

cos 90 = 0

so when we’ll multiply all the other values with cos 90 it will terminate to 0

cos1.cos2...........cos90.......cos180 =cos1.cos2.......... $\times$ 0 $\times$ ............cos180

= 0

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