Question

Cos1.Cos2.Cos3..............................Cos99.Cos100=?

Answer 1

Cos1xCos2xCos3......................Cos90................Cos99xCos100
Cos90=0
Cos1xCos2xCos3..................x0x..................Cos99xCos100=0
anything multiplied to zero is equal to 0
                    

Answer 2

Cos1.Cos2.Cos3..............................Cos99.Cos100 = 0

Solution:  

To find: Cos1.Cos2.Cos3.....................Cos90.........Cos99.Cos100 = ?  

As we know, Cos 90 = 0

Cos1.Cos2.Cos3.....................0.........Cos99.Cos100

As we can see in this series multiplication cos 1 to 100 is given but the answer of the series will be zero.

Because the term cos 90 comes in the series. Now we all know that cos 90 = 0.  

Therefore, the value of the entire multiplication series is 0 because zero multiplied by zero is equal to zero.