Question

If cot A = 2/5 , find the value of 4 + 4 cos^2 A

Answer 1

$\huge{\overbrace{\underbrace{\mathtt{\green{ANSWER}}}}}$

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 ➺ Cot A=( 2/5 )

∴ tan A =( 5/2 )

[cosec θ = 1 /sinθ ⟹√(1+tan²θ)/ tanθ]

➺4+4cot²A

➺4 (1+cot²A)

➺4 (cosec²A)

➺4×( √(1+tan²θ)/ tanθ)

➺4×[ √(1+(5/2)²)/ (5/2)]

➺4×[ √(1+(25/4))/ (5/2)]

➺4×[ √( (4+25)/ 4) / (5/2)]

➺4×[ √(29/ 4) / (5/2)]

➺4×[ 1.34 / (5/2)]

➺4×[ 1.34 ×2 / 5]

➺4×[ 2.68 / 5]

➺4×[ 0.536 ]

➺2.144

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☆✿╬ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ᴜ╬✿☆

Answer 2

Answer:

I don't know so sorry OK bye