3 years ago

Solve this pleaseplease

Mathematics

1 answer:

tamaranim1 [39]3 years ago

6 0

Answer:

Step-by-step explanation:

cos(2a) = cos^2(a) - sin^2(a)

cos(2a) = 2cos^(a) - 1

cos(2a) = 11/25

11/25 = 2 cos^(a) - 1 Add 1 to both sides

1 + 11/25 = 2 cos^2

25/25 + 11/25 = 2 cos^2(a)

36/25 = 2 cos^2 (a) Divide by 2

36/50 = cos^2 (a) Take the square root of both sides.

6/5*sqrt(2) = cos(a)

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Solve this pleaseplease​

Solve this pleaseplease