Question

check whether true or false for given number 2cos square45 ° -1 = cos90°​

Answer 1

Answer:it is true

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Answer 2

Answer:

cos 2 (a)=cos2 (45)=cos90=0

2cos^2a-1

2cos^2 (45)-1

2 (1/_/2)^2-1

2*1/2-1=0

1-2sin ^2a

1-2 (1/_/2)^2

1-2*1/2

1-1= 0

so all are equal