To find the value of angle A given the equation 2sin²A - 1/3 = cos²A, we can use trigonometric identities to simplify the equation.
We know that sin²A + cos²A = 1 (Pythagorean identity) and cos²A = 1 - sin²A.
Substitute the value of cos²A in the equation:
2sin²A - 1/3 = 1 - sin²A
Now, simplify the equation:
3sin²A - 1 = 3 - 3sin²A
6sin²A = 4
sin²A = 4/6
sin²A = 2/3
Take the square root of both sides to find sinA:
sinA = √(2/3)
Now, find the value of angle A by taking the inverse sine function (sin⁻¹) of √(2/3):
A = sin⁻¹(√(2/3))
Therefore, the value of angle A in radians is sin⁻¹(√(2/3)).