Question

If sin A = 1/2 , then the value of 4cos³ A - 3 cos A is

Answer 1

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Answer 2

sinA = 1/2

$cosec \: \: = \frac{1}{sin}$

cosecA = 2

${sin}^{2}(a) = {cos}^{2} (a) - 1$

sin^2A + cos^2A = 1

cos^2A = 1-sin^2A

= 1 - (1÷2)^2

= 1 - 1÷4

= 4-1 ÷ 4

= 3÷4

cosA = √3/2

$sec = \frac{1}{cos}$

secA = 2/√3

$\tan(a) = \frac{sin}{cos}$

tanA = 1/2 ÷ √3/2

= 1/2 × 2/√3

= 1/√3

$cot = \frac{1}{tan}$

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