Question

Cos²25 - Sin²65 - tan²45 -
a)1
b)2
c)-1
d)0
please answer fast​

Answer 1

Answer:

2.

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Cos²25 - Sin²65 - tan²45 =cos^2(90-65) -(1-cos^2 65)-1

=(sin^2 65) +(cos^2 65)-1-1 =1-1-1= -1