I need help proving this ASAP

1 + tan²A = sec²A = 1/cos²A

2tan(X/2)/(1+tan²(X/2))

= 2tan(X/2)cos²(X/2)

= 2[sin(X/2)÷cos(X/2)]cos²(X/2)

= 2sin(X/2)cos(X/2)

= sin(X)

Because sin(2A) = 2sin(A)cos(A)

fahrenheit

step-by-step explanation:

fahrenheit is more precise than celsius. the ambient temperature on most of the inhabited world ranges from -20 degrees fahrenheit to 110 degrees fahrenheit—a 130-degree range. on the celsius scale, that range is from -28.8 degrees to 43.3 degrees—a 72.1-degree range. this means that you can get a more exact measurement of the air temperature using fahrenheit because it uses almost twice the scale.