CLASS-9
TRIGONOMETRICAL RATIOS - T-RATIOS OF 0ᵒ and 90ᵒ

T-Ratios of 0ᵒ and 90ᵒ -

We define T-Ratios of 0ᵒ as under –

(i)                  sin 0ᵒ = 0,

(ii)                cos 0ᵒ = 1,

(iii)              tan 0ᵒ = 0,

(iv)              cosec 0ᵒ = undefined,

(v)                sec 0ᵒ = 1,

(vi)              cot 0ᵒ = undefined,

We define T-Ratios of 90ᵒ as under –

(i)                  sin 90ᵒ = 1,

(ii)                cos 90ᵒ = 0,

(iii)              tan 90ᵒ = undefined,

(iv)              cosec 90ᵒ = 1,

(v)                sec 90ᵒ = undefined,

(vi)              cot 90ᵒ = 0,