Question

express the following terms in trigonometrical ratios of angle between 0° and 45° ​

Answer 1

Step-by-step explanation:

First , we have to find the trigonometrical system ratios of angle between 0° and 45° .

Cos 13 × cosec 81° = cos 13 × cosec ( 81° - 13)

Cos 13 × sec 13 as ( cosec81 - A = sec A )

Cos 13 × 1/cos 13 = 1 ( as 1/cos 13 = sec 13 )

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Answer 2

Answer:

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