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cos²a + cos²(a+120°) + cos(a-120°)
cos²a + cos²(a+120°) + cos(a-120°) = 3/2
1 answer
asked by
Kewal
1,480 views
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
2 answers
asked by
piyush yadav
1,032 views
Show that 1-cos2A/Cos^2*A = tan^2*A
1-cos2A/Cos^2*A = [Cos^2(A) - Cos(2A)]/Cos^2(A). Substitute: Cos(2A) = 2Cos^2(A) - 1: [1 -
0 answers
asked by
Paul C
740 views
if in a triangle ABC m angle A=π/2, then value of cos2 A + cos2 B + cos2 C =?
1 answer
asked by
Anand
468 views
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
1 answer
asked by
Chris
513 views
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 =
1 answer
96 views
a. Given that sin2 𝑥, cos2 𝑥 𝑎𝑛𝑑 5cos2𝑥 − 3sin2 𝑥 are in arithmetic progression, find the value of
i.
3 answers
asked by
Benny
158 views
The expression oos² θ/sin θ + sin θ is equivalent to
1) 1 + cos² θ 2) cos² θ 3) sin θ 4) csc θ
1 answer
asked by
Moe
844 views
Why does
1 - COS2(Squared) _________________ COS2 = tan2
2 answers
asked by
Joe
529 views
how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
1 answer
asked by
lungisile ntobela
1,159 views