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hi plz help me out prove that 4 cos(360/7)cos(180/7) -1=2 cos(360/7)

hi plz help me out
prove that 4 cos(360/7)cos(180/7) -1=2 cos(360/7)

Grade:12

2 Answers

Ajay
209 Points
6 years ago
Are you sure that you have posted correct question.
When I calulate the LHS and RHS using claculator both sides are not equal
RHS = 0.335 and LHS = 0.793
Ankit Jaiswal
165 Points
6 years ago
Try it again and use degree instead of radian 
the question is correct i solved it using calulator

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