Performance Task - Trigonometric Identities: Use trigonometric identities to verify each expression is equal. Please include the trig identities/step-by-step explanation, if possible; I need to show my work, and I'd like to be able to understand how to get to the answer.

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

step-by-step explanation:

the true ones are a b and d