Using the information from steps 1 and 2 can you walk me through step 3 and 4. Thank you! (Step 3:Simplify (2x^2+4xy+2y^2) to determine the right side of the identity. show all work for the algebraic proof.)

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .