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cos²a + cos²(a+120°) + cos(a-120°)

cos²a + cos²(a+120°) + cos(a-120°) = 3/2
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2. asked by Kewal
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If S=1/2^2cos1 + 1/cos1¤cos2+1/2^3 cos1 ¤cos2¤cos2^2 + .......... upto 10 terms . If S= sina(cotb-cotc) where a,b,c€N Then
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2. asked by piyush yadav
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Show that 1-cos2A/Cos^2*A = tan^2*A1-cos2A/Cos^2*A = [Cos^2(A) - Cos(2A)]/Cos^2(A). Substitute: Cos(2A) = 2Cos^2(A) - 1: [1 -
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2. asked by Paul C
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if in a triangle ABC m angle A=π/2, then value of cos2 A + cos2 B + cos2 C =?
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2. asked by Anand
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Which expression is equivalent to (sin x + 1)(sin x − 1)?A. cos2^x B. -cos2^x C. cos2^x + 1 D. cos^2x − 1 E. -cos^2x + 1
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2. asked by Chris
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45) Prove the following identities. Use a separate piece of paper.a) sec x − tan x = 1−sinx cos x b) (csc x − cot x) 2 =
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a. Given that sin2 𝑥, cos2 𝑥 𝑎𝑛𝑑 5cos2𝑥 − 3sin2 𝑥 are in arithmetic progression, find the value ofi.
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2. asked by Benny
3. 158 views
The expression oos² θ/sin θ + sin θ is equivalent to1) 1 + cos² θ 2) cos² θ 3) sin θ 4) csc θ
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2. asked by Moe
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Why does1 - COS2(Squared) _________________ COS2 = tan2
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2. asked by Joe
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how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
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2. asked by lungisile ntobela
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