Sin 8A = 8Sin A. CosA. Cos2A.Cos4A

Prove that

Cos^{2}A + Sin^{2}A.Cos2B = Cos^{2}B + Sin^{2}A.Cos2B

(2CosA + 1)(2CosA-1) = 2Cos2A + 1

mskhanal
July 17, 2020

Sin 8A = 8Sin A. CosA. Cos2A.Cos4A

Prove that

Cos^{2}A + Sin^{2}A.Cos2B = Cos^{2}B + Sin^{2}A.Cos2B

(2CosA + 1)(2CosA-1) = 2Cos2A + 1

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Some geometric means are inserted between 2 and 128. If the third mean is 8, find the number of means. 4 GM are inserted between 5 and x. If the third mean is 40, find out other means and the value of X. There are 5 geometric means between a and b. If the second and the last means are 63 and 1701 respectively, find the other means Find the number of GMs inserted between 3 and 729, where the ratio of the first mean to last mean is 1:127 Find the number of GMs inserted between 4 and 128 where the ratio of the second mean to last mean is 1:8

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