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Find cos2A when cosA =

  1. Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
    1. answers icon 1 answer
    2. Piwo asked by Piwo
    3. views icon 1,211 views
  2. Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
    1. answers icon 1 answer
    2. Piwo asked by Piwo
    3. views icon 619 views
  3. Find cos2A when cosA = -3/5 and π/2<A<π.A) -24/25 B) -7/25 C) 7/24 D) 24/7
    1. answers icon 1 answer
    2. TeeKay asked by TeeKay
    3. views icon 503 views
  4. I need to prove that the following is true. Thanks.csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) =
    1. answers icon 0 answers
    2. Dirk asked by Dirk
    3. views icon 979 views
  5. Let A=(cosA -sinA)(sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
    1. answers icon 1 answer
    2. James asked by James
    3. views icon 654 views
  6. how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
    1. answers icon 1 answer
    2. lungisile ntobela asked by lungisile ntobela
    3. views icon 1,170 views
  7. Prove :1 + Sin2A/ Cos2A = CosA + SinA / CosA- SinA
    1. answers icon 5 answers
    2. clive asked by clive
    3. views icon 2,501 views
  8. CosA x cos2A + ((sin2A)^2)/2cosA
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    2. Makhosini Maluvana asked by Makhosini Maluvana
    3. views icon 507 views
  9. Given:cosA= 4/5 0(less than or equal to)A(less than of equal to)90*find sinA, sin2A, cos2A
    1. answers icon 2 answers
    2. olivia asked by olivia
    3. views icon 539 views
  10. Hi, can someone give me the answer to this question:secA-tanA=1/4. Find cosA I got: CosA=4(1-sinA) Is my answer good? Now
    1. answers icon 2 answers
    2. Shym asked by Shym
    3. views icon 943 views