Question

Value of 2cos2 15° - 1 is​

Answer 1

Answer:

answer is 30 degree plz mark as brainliest answer

Step-by-step explanation:

Answer 2

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Answer:

=2(cos15)(cos15) -1

=2(0.9659)(0.9659)-1

=1.866-1

=0.866

Here another way to answer this question.

Recall the identity cos(2x) = 2 cos²(x) - 1

So, 2 cos²(15°) - 1

= cos(2*15°)

= cos(30°)

= √3/2

= 0.866

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