A student uses the following steps to prove the sine sum identity. The proof is incorrect. Which steps is incorrect

Step 4

Step-by-step explanation:

I guessed 3 and got it wrong, I was told it’s 4

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

step-by-step explanation: