Prove that, cos200 + cos400 + cos600 + cos800 =1/16 - Maths - Trigonometric Functions

Question

Prove that, cos200 + cos400 +
cos600 + cos800 =1/16 ?

Lalit Mehra · Accepted Answer

Hi! If the given question is Prove that cos20â°cos40â°cos60â°cos80â° =1/16, then the answer is given as,

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Prove that, cos200 + cos400 + cos600 + cos800 =1/16 ?