How many formulas are there in trigonometry?
Answers
Answer:
The six trigonometric functions are sine, cosine, secant, cosecant, tangent and cotangent. So now all the trigonometric ratios are based on the lengths of these lengths of the side of the triangle and the angle of the triangle.
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Answer:
There are many different kind of identities in Trigo.
A}
1) sinθ÷cosθ = tanθ
2) sin²θ + cos²θ = 1
3) 1 + tan²θ = sec²θ
4) 1 = cot²θ = cosec²θ
B}
1) sin ( 90 - θ ) = cos∅
2) cos ( 90 - θ ) = sin
3) sin ( 180 - θ ) = sinθ
4) cos ( 180 - θ ) = cosθ
C}
1) sin²θ = 1 - cos2θ ÷ 2
2) cos²θ = 1 + cos2θ ÷ 2
tan²θ = 1 - cos2θ ÷ 1 + cos2θ
Additional Information:
Trigonometric Identities of specific angles.
θ 0° 30° 45° 60° 90°
sin 0 1/2 1 /√2 √3/2 1
cos 1 √3/2 1/√2 1/2 0
tan 0 1/√3 1 √3 ∞
cot ∞ √3 1 1/√3 0
sec 1 2/√3 √2 2 ∞
cosec ∞ 2 √2 2/√3 1
This table will really help you in memorisng your specific angles which are generally asked in an examination.