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Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2) Prove: 2cot-2tanx=

  1. Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)Prove: 2cot-2tanx= 4-2sec^2x / tanx
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    2. Sarah asked by Sarah
    3. views icon 975 views
  2. Prove:sin2x / 1 - cos2x = cotx My Attempt: LS: = 2sinxcosx / - 1 - (1 - 2sin^2x) = 2sinxcosx / - 1 + 2sin^2x = cosx / sinx - 1 =
    1. answers icon 5 answers
    2. Anonymous asked by Anonymous
    3. views icon 1,497 views
  3. If sec(x+y),sec(x),sec(x-y) are in A.P. then prove that cosx= +-√2 cos y/2 where cosx and cosy are not equals to 1,
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    2. Kinjal asked by Kinjal
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  4. prove that cosx(tanx+2)(2tanx+1)=2secx+5sinx
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    2. krishan asked by krishan
    3. views icon 1,988 views
  5. Proving identities:1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = sin^2x - cos^2x 3) 1/cosx - cosx = sin x tan x 4) sin x + tan x
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    2. Deepa asked by Deepa
    3. views icon 805 views
  6. I need to prove that the following is true. Thanks(2tanx /1-tan^x)+(1/2cos^2x-1)= (cosx+sinx)/(cosx - sinx) and thanks
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    2. abdo asked by abdo
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  7. sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y)prove this identity
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    2. JK asked by JK
    3. views icon 1,318 views
  8. prove (tan^3x/1 tan^2x) (cot^3x/1 cot^2) = (1-2sin^2x cos^2x)/sinx cosx
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    2. pankaj asked by pankaj
    3. views icon 650 views
  9. Please prove:2sinx+sin2x = 2sin^3(x)/1-cosx
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    2. Veronica asked by Veronica
    3. views icon 638 views
  10. Prove the following identity:-(i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx
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    2. MATHS asked by MATHS
    3. views icon 626 views