If \( \sin ^{2} A=x \) and \( \prod_{r=1}^{4} \sin (r A)=a x^{2}+b x^{3}+c x^{4}+d x^{5} \) then... VIDEO
If \( \sin ^{2} A=x \) and \( \prod_{r=1}^{4} \sin (r A)=a x^{2}+b x^{3}+c x^{4}+d x^{5} \) then the value of \( 10 a-7 b+15 c-5 d \) must behttps://bit.ly/YTAI_PWAP https://www.pw.live
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