Question

Prove that cos 1 cos 2 cos 3 cos 180 is equal to zero

Answer 1

Step-by-step explanation:

We know that cos 90=0.

Frm question

Cos1.cos2.cos3...........cos90..........cos180

Which is:

Cos1. Cos2. Cos3......... 0........cos180

Therfore

RHS=0

Hence proved

Answer 2

Answer:

true

Step-by-step explanation:

cos1×cos2×.....×cos90×.....×cos180

= .....×0×......

=0(PROVED(