E-Storetrigo formulassss.....must see (beginners)
28 Jul 2007 13:00:48 IST
trigo formulassss.....must see (beginners)
1) sin(A+B) = sinAcosB + cosAsinB
2) sin(A-B) = sinAcosB - cosAsinB
3) cos(A+B) = cosAcosB - sinAsinB
4) cos(A-B) = cosAcosb + sinAsinB
5) tan(A+B) = tanA + tanB / 1 - tanAtanB
6) tan(A-B) = tanA - tanB / 1 + tanAtanB
7) cot(A+B) = cotAcotB - 1 / cotA + cotB
8) cot(A-B) = cotAcotB + 1 / cotB - cotA
9) sin(A+B)sin(A-B) = sin^2A - sin^2B = cos^b - cos^2A
10) cos(A+B)cos(A-B) = cos2B - sin2A = cos2A - sin2B
11)sin(A+B+C) = sinAcosBcosC + cosAsinBcosC - sinAsinBsinC
12)cos(A+B+C) = cosAcosBcosC - sinAsinBcosC - sinAcosB sinC - cosAsinBsinC
13)tan(A+B+C) = tanA+tanB+tanC - tanAtanBtanC/1-tanAtanb-tanBtanc-tanCtanA
14)sin2# = 2sin#cos# = 2tan#/ 1+ tan2 #
15)cos2# = cos2# - sin2# = 2cos2# -1 = 1 - 2sin2# = 1 - tan2# / 1 + tan2#
16)1 - cos# / sin# = tan( # / 2)
17)1 + cos# / sin# = cot ( # / 2)
18)1 - cos# / 1 + cos# = tan2 # /2
19) 1 + cos# / 1 - cos# = cot2 # / 2
20) sin3@ = 3sin@ - 4sin3@
21)cos3@ = 4cos3@ - 3cos@
22) tan3@ = 3tan@ - tan3@ / 1 - 3tan2@
23)cosA . cos2A . cos3A .......cos2n-1 A = sin2n A / 2n sinA
24) sinC + sinD = 2sin( C + D/ 2) cos (C - D/2)
25) sinC - sinD = 2cos( C + D/2) sin( C-D/2)
26)cosC + cosD = 2cos(C+D/2)cos(C-D/2)
27)cosC - cosD = -2 sin(C+D/2) sin(C-D/2)
28) tanA + tanB = sin(A+B) / cosAcosB
29)tan(A - tan B = sin(A-B) / cosA cosB
30)2sinAcosB = sin(A+B) + sin (A - B)
31) 2cosA sinB = sin(A+B) sin(A-B)
32) [ sinA/2 + cosA/2]2 = 1 + sinA
33) [sinA/2 - cosA/2 ]2 = 1 - sinA
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Isha mehta
Scorching goIITian
Joined: 13 Jun 2007 21:48:10 IST
Posts: 211
28 Jul 2007 13:13:33 IST
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