tanθ =3/4 হলে cosecθ এর মান কত ?

A 3/5

B 5/3

C 4/3

D 5/4

Solution

Correct Answer: Option B

আমরা জানি 
tanθ = লম্ব/ভূমি
অতিভুজ = 4 , লম্ব = 3

এখন 
(লম্ব)2 + (ভূমি)2 = (অতিভুজ)2
32 +42 = (অতিভুজ)2
9 + 16  = (অতিভুজ)2
25 = (অতিভুজ)2
52 = (অতিভুজ)2
অতিভুজ = 5

 cosecθ= অতিভুজ/লম্ব
= 5/3

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