Now that you have a better understanding of some of the math topics you've recently covered, take some time to think about these questions. then join the discussion and post your answers.

1. why would knowing the pythagorean identity sin^2x+ cos^2x=1 and the sum identities allow you to prove all the other identities you have seen in this lesson?
2. is sine of (sin^-1x)=sin^-1(sinx) an identity? why or why not?
3. how would you explain to someone who has not yet studied trigonometry the difference between an identity and an equation?
4. what questions do you still have about the unit? ask them here, and your classmates may give you the answers you seek.

In tossing one coin 10 times, what are your chances for tossing a head? a tail? 2. in tossing one coin 100 times, what are your chances for tossing a head? a tail? 3. in tossing one coin 200 times, what are your chances for tossing a head? a tail? deviation = ((absolute value of the difference between expected heads and observed heads) + (absolute value of the difference between expected tails and observed tails)) divided by total number of tosses. this value should always be positive. 4. what is the deviation for 10 tosses? 5. what is the deviation for the 100 tosses? 6. what is the deviation for 200 tosses? 7. how does increasing the total number of coin tosses from 10 to 100 affect the deviation? 8. how does increasing the total number of tosses from 100 to 200 affect the deviation? 9. what two important probability principles were established in this exercise? 10. the percent of occurrence is the obtained results divided by the total tosses and multiplied by 100%. toss the coins 100 times and record your results. calculate the percent occurrence for each combination. percent head-head occurrence: percent tail-tail occurrence: percent head-tail occurrence: