Question

What are trigonometrical identies..?

Answer 1

In a right angled triangle , the three sides ,i.e. the perpendicular(P) , base (B) and Hypotenuse(H) give us 6 trigonometrical ratios or identities.These are:
Sine (sin)=$\frac{P}{H}$
Cosine (cos)=$\frac{B}{H}$
Tangent (tan)=$\frac{P}{B}$
The above are the standard ratios , the ones given below are the reciprocal ratios:
Secant (sec)=$\frac{H}{P}$
Cosecant (cosec)=$\frac{H}{B}$
Cotagent (cot)=$\frac{B}{P}$
Remember,
sinФ * secФ = 1
cos Ф* cosecФ=1
tanФ* cotФ=1
----------------------------------------------------------------------

Answer 2

Step-by-step explanation:

Trigonometric identies are given below-

cos ²A + sin² A =1

1+tan²A = sec²A

where- 0≤A≤90°

cot²A + 1 = cosec² A

where- 0≤A≤90