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Trigonometric Identities:
) sin (x +
y) = sinx cosy + cosx siny
(i) sin (x-y) = sinx cosy-cosx siny
(ii) cos (x+ y) = cosx
cosy sinx siny
(iv) cos(x-y) =cosxcosy+sinx siny
tanx+ tany
tan(x + y)-tanx.tany
(v)
tanx-tany
1+ tanx.tany
(vi) tan(x- y)
(vii) cot(x+
+y)= -
Cotx.coty-1
coty+cobx
cot(x-y) = COtX.Coty+1
coty-cotx
(vii)
2tanx
(ix) sin2x 2sinxcosx
1+tanx
(x) cos2X =cosxX- sinfx =2cosx-1 =1-2sin?x = anX
1+tanf x
2tanx
(xi) tan2x =
1-tanx
(xii) sin3x 3sinx - 4sin'x
(xii) cos3x = 4cos'x -3
3cos x
(xiv) tan3x= tanx-tan'x
1-3tan x
xv) coSX +
cosy 2cos cos
2
(xvi) cosx - cosy =2sinsin
(xvii) sinx+ siny 2sin cosY
(xvii) sinx- siny =2cossin
(xix) 2sinx cosy= sin(x + y)+sin(x- y)
(xx) 2cosx siny = sin(x +y)-sin(x-y)
(xoxi) 2c0sx cosy= cos(x+ y) +cos(x-y)
(xxii) 2sinx siny = cos(x-y)-cos(x + y)
1-cosA
(xxii) sinA 2
Sing ' or will bedecided
according to the quadrantin
1+coSA
(xxiv) cos *2
A
which anglelies
(x)tan *1+cosA
1-cosA
sin18 5-1 V10+2/5
cos18
4
sin36° V10-2 5
4
cos36 v5+1
4

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trigo. formule (1).pdf

  • 1. Trigonometric Identities: ) sin (x + y) = sinx cosy + cosx siny (i) sin (x-y) = sinx cosy-cosx siny (ii) cos (x+ y) = cosx cosy sinx siny (iv) cos(x-y) =cosxcosy+sinx siny tanx+ tany tan(x + y)-tanx.tany (v) tanx-tany 1+ tanx.tany (vi) tan(x- y) (vii) cot(x+ +y)= - Cotx.coty-1 coty+cobx cot(x-y) = COtX.Coty+1 coty-cotx (vii)
  • 2. 2tanx (ix) sin2x 2sinxcosx 1+tanx (x) cos2X =cosxX- sinfx =2cosx-1 =1-2sin?x = anX 1+tanf x 2tanx (xi) tan2x = 1-tanx (xii) sin3x 3sinx - 4sin'x (xii) cos3x = 4cos'x -3 3cos x (xiv) tan3x= tanx-tan'x 1-3tan x xv) coSX + cosy 2cos cos 2 (xvi) cosx - cosy =2sinsin (xvii) sinx+ siny 2sin cosY (xvii) sinx- siny =2cossin (xix) 2sinx cosy= sin(x + y)+sin(x- y) (xx) 2cosx siny = sin(x +y)-sin(x-y) (xoxi) 2c0sx cosy= cos(x+ y) +cos(x-y) (xxii) 2sinx siny = cos(x-y)-cos(x + y) 1-cosA (xxii) sinA 2 Sing ' or will bedecided according to the quadrantin 1+coSA (xxiv) cos *2 A which anglelies (x)tan *1+cosA 1-cosA
  • 3. sin18 5-1 V10+2/5 cos18 4 sin36° V10-2 5 4 cos36 v5+1 4