Math, asked by iisdclass9i, 10 months ago

without using trigonometric tables evaluate

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Answered by pranavchoudhary1056

2

Answer:

5

Step-by-step explanation:

cos70 = sin 20

as cos(90-x) = sin x

so, 7cos 70/2sin 20 =7/2 × 1 = 7/2

similarly ,

tan (90-x) = cot x

sec(90-x) = cosec x

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