- Help me solve a - ((tan 15)*a)/2? I know it will be (√3/2)a, but I need to see the steps.?

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How has the physical geography of Latin America, North America, & Europe impacted their development? How to solve like this question? What is formula for PI And DI? Solve the system of linear equations numerically. x+y=-3
x-y=-5? Determine (f ○ g)^-1(x) if f(x) = √(x² + 1) and (f ○ g)(x) = √(x² - 4x + 5) / (x - 2) ?