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Since you should evaluate a product, you need to identify if there is a factor that equals zero, such that the product cancels.
You need to remember that `cos 90^o = cos 270^o = 0` .
Notice that one of factors of the given product is `cos 90^o` , hence, the product cancels such that:
`cos 1^o*cos 2^o*cos 3^o*.....*cos 90^o*...*cos 103^o`
`cos 1^o*cos 2^o*cos 3^o*.....*0*...*cos 103^o = 0`
Hence, evaluating the given product yields `cos 1^o*cos 2^o*cos 3^o*.....*cos 90^o*...*cos 103^o = 0` .
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