Question

Prove that
cos^2(π/10)+cos^2(2π/5)+cos^2(3π/2)+cos^2(9π/10)=2​

Answer 1

Step-by-step explanation:

74) cos(x – y) = –1 then cos x + cos y + sin x + sin y =....Hii mate here is ur answer plz mark me as brainlist friend and thank me...plz give more thanks and get thanks don't forget to follow me #friend══════ •『 ♡』• ════════════ •『 ♡』• ═══════════

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