formula trigonometry
Answers
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.
Answer:
following are the important formula of trigonometry.
- sin²∅ + cos²∅ = 1
- sec²∅ - tan²∅ = 1
- cosec²∅ - cot²∅ = 1
- sin∅× cosec∅ = 1
- sec∅ × cos∅ = 1
- tan∅× cot∅ = 1
- sin2A = 2sinAcosA
- cos2A = cos²A - sin²A