Answer: greater than 10 & less than 20
Step-by-step explanation:
91 rounded to the nearest hundred is 100 because 91 is closer to 100 than ? on the number line
2 answers:
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Answer:
see explanation
Step-by-step explanation:
Consider the left side
A +
A - 2cos²Asin²A ← is the expansion of
= (cos²A - sin²A)²
Substitute sin²A = 1 - cos²A
= (cos²A - (1 - cos²A) )²
= (cos²A - 1 + cos²A)²
= (2cos²A - 1 )²
= right side , then proven