HELP The formulas are:

sin2u = 2sinx cosx

tan2u = 2tanu / 1 - tan^2u
= sin2u / cos2u

cos2u = cos^2u - sin^2u
= 2cos^2u - 1
= 1 - 2sin^2u

50- 250 is correct i did that one too

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116