CosA=1/secA
TanA=1/CotA
CotA=1/TanA
SecA=/CosA
CosecA=1/SinA
SinA=Perpendicular/Hypotenuse
CosA=Base/ Hypotenuse
TanA=Perpendicular/Base
CotA=Base/Perpendicular
SecA=Hypotenuse/Base
CosecA=Hypotenuse/Perpendicular
Sin²A+Cos²A=1
Sec²A-Tan²A=1
Cosec²A-Cot²A=1
Sin2A=2SinACosA
Cos2A=1-2Sin²A ,2Cos²A-1
sin(2A) = [2tan A/(1+tan²A)]
cos(2A) = cos²A–sin²A = [(1-tan²A)/(1+tan²A)]
tan(2A) = [2tan(A)]/ [1−tan²(A)]
sec (2A) = sec²/(2-sec²A)
cosec(2A) = (sec A. cosecA)/2
sin(A+B) = sinAcosB+cosAsinB
cos(A+B) = cosAcosB–sinAsinB
tan(A+B) = (tan A+ tanB)/ (1−tanA•tan B)
sin(A–B) = sinAcosB–cosAsinB
cos(A–B) = cosAcosB + sinAsinB
tan(A−B) = (tan A–tan B)/ (1+tan A • tan B)
Sin 3A = 3sin A – 4sin3A
Cos 3A = 4cos3A-3cos A
Tan 3A = [3tanA-tan3A]/[1-3tan2A]
#Co-function Formula#
sin(90°−A) = cosA
cos(90°−A) = sinA
tan(90°−A) = cotA
cot(90°−A) = tanA
sec(90°−A) = cosecA
cosec(90°−A) = sec A
#Periodic Formula#
sin(2nπ + A ) = sin A
cos(2nπ + A) = cos A
tan(2nπ + A ) = tan A
tyle="background-color: white;">cot(2nπ + A ) = cot A
sec(2nπ + A) = sec A
cosec(2nπ + A ) = cosec A
High school Trigonometric Ex. 8A
Link given below👇
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