Question

The value of the expression (4° + 5°) (4° − 5°) is

a) −9 b) 2

c) 1 d) 0​

Answer 1

Answer:

a°=1

so,

(1+1)(1-1)

2(0)= 0

Step-by-step explanation:

so the answer is 0 (option d)

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Answer 2

Answer:

1² - 1²

Step-by-step explanation:

as per rule of identity.