Question

plssss fast with explanation plsss fast I will mark you as brainliest ​​

Answer 1

Answer:

(b) cos60°

Step-by-step explanation:

1-2(1/2)²

=1-2×1/4

=1-1/2

=2-1/2

=1/2

and we know cos 60°=1/2

And that's your answer

Answer 2

1 - 2sin^2 30°

we know ,

cos 2x = 1- 2 sin^2 x.

so,here

= cos (2×30°)

= cos 60°

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