**1. Trigonometry:**

In a right
angled Δ OAB, where ∠BOA = θ,

**2. Trigonometrical Identities:**

i)sin² θ + cos² = 1

ii)1 + tan² θ = sec² θ

iii)1 + cot² θ = cosec² θ

**3.Values of T-ratios:**

**4. Angle of Elevation:**

Suppose a
man from a point O looks up at an object P, placed above the level of his eye.

Then, the
angle which the line of sight makes with the horizontal through O, is called
the angle of elevation of P as seen from O.

Angle of
elevation of P from O = AOP.

**5.Angle of Depression:**

Suppose a
man from a point O looks down at an object P, placed below the level of his
eye, then the angle which the line of sight makes with the horizontal through
O, is called the angle of depression of P as seen from O.

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