1. Basic of Trigonometry:-
Basic of Trigonometry maths में very important है चाहे फिर exam board का हो या फिर competition हो। Basic of Trigonometry formula's से question आता ही है। इसीलिए आज हम Basic of Trigonometry के सारे formula's को एक साथ देखेगें।
*Right angle triangle (समकोण त्रिभुज) में, ϴ(theta) के सामने वाली side = perpendicular होती है।
** 90 degree के सामने वाली side = hypotaneous
***And the remaining side = base
Note: PBP/HHB
P=perpendicular = a
H=hypotaneous = h
B=base. = b
Trigonometry Angles:-
SinA = a/h. CosecA = h/a.
CosA = b/h. SecA. = h/b.
TanA = a/b. CotA. = b/a.
SinA / CosA = TanA
CosA / SinA = CotA
SinA×CosecA = 1
CosA×SecA. = 1
TanA×CotA. = 1
Trigonometry quadrant:-
Trigonometry quadarant |
In case of quadrant:-
1st quad. - (0-90) degree
2nd quad.- (90-180) degree
3rd quad.-(180-270) degree
4th quad.-(270-360) degree
Note:
(90±ϴ) and (270±ϴ) degree में interchange हो जाते हैं।
Interchange quadrant:-
{Sin⇔ Cos},
{Tan⇔Cot},
{Sec⇔ Cosec}
Note:-
(180±ϴ) and (360±ϴ) में change नहीं होता है।
2. Trigonometry identities:-
sin^2ϴ+cos^2ϴ=1
1+tan^2ϴ=sec^2ϴ
1+cot^2ϴ=cosec^2ϴ
(A+B) & (A-B) related Formula's
1. Sin(A+B)=SinA.CosB+CosA.SinB
2. Sin(A-B)=SinA.CosB-CosA.SinB
3. Cos(A+B)=CosA.CosB-SinA.SinB
4. Cos(A-B)=CosA.CosB+SinA.SinB
5.
Tan(A+B)=TanA+TanB/(1- TanA.TanB)
6.
Tan(A-B)=TanA-TanB/(1+TanA.TanB)
7.
Cot(A+B)=(CotA.CotB-1)/(CotB+CotA)
8.
Cot(A-B)=(CotA.CotB+1)/(CotB-CotA)
(C+D) & (C-D) related formula
1.
SinC+SinD={2Sin(C+D)/2}.{Cos(C-D)/2}
2.
SinC-SinD={2Cos(C+D)/2}.{Sin(C-D)/2}
3.
CosC+CosD={2Cos(C+D)/2}.{Cos(C-D)/2}
4.
CosC-CosD={2Sin(C-D)/2}.{Sin(D-C)/2}
Negative sign effect:-
Sin(-ϴ)=-Sinϴ
Cos(-ϴ)=Cosϴ
Tan(-ϴ)=-Tanϴ
Cot(-ϴ)=-Cotϴ
Sec(-ϴ)=Secϴ
Cosec(-ϴ)=-Cosecϴ
Other A & B related formula's:-
1.
2SinACosB=Sin(A+B)+Sin(A-B)
2.
2CosASinB=Sin(A+B)-Sin(A-B)
3.
2CosACosB=Cos(A+B)+Cos(A-B)
4.
2SinASinB=Cos(A-B)-Cos(A+B)
5.
Sin(A+B)Sin(A-B)=Sin^2A-Sin^2B
6.
Cos(A+B)Cos(A-B)=Cos^2A-Sin^2B.
A/2 related formula's:-
1.
Sin(A/2)=√{1-Cos(A/2)}/2
2.
Cos(A/2)=√{1+Cos(A/2)}/2
3.
Tan(A/2)=√{1-Cos(A/2)}/ √{1+Cos(A/2)}
~:Some Imp. Values :~
Sin18 =(√5-1)/4,
Cos36 =(√5+1)/4,
Sin36 =√{10-2√5}/4,
Cos18 =√{10+2√5}/4
2A related formula's:-
1. Sin2A=2SinACosA
=2tanA/(1+tan^2A)
2. Cos2A=Cos^2A-Sin^2A
=1-2Sin^2A
=2Cos^2A-1
=(1-tan^2A)/1+tan^2A
3. Tan2A=2tanA/(1-tan^2A)
3A related formula:-
1.
Sin3A=3SinA-4Sin^3A
2.
Cos3A=4Cos^3A-3CosA
3.
Tan3A=(3tanA-tan^3A)/(1-3tan^2A)
Basic of Trigonometry के formula's याद करने के बाद आप बहुत ही आसानी से question solve कर पाएगें ।
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