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Maru [420]
3 years ago
9

Pleaseee help guys:(

Mathematics
2 answers:
nadya68 [22]3 years ago
8 0
≈0.524094
If you ever needed help with math you can download Photomath too that’s what I use
nadezda [96]3 years ago
7 0

Answer:

-\sqrt{3} /2

Step-by-step explanation:

Note that this looks like the identity:

cos(A + B) = cosAcosB - sinAsinB.

In this case, A = π/12 and B = 3π/4. So, we can say that the given equation:

cos(π/12)cos(3π/4) - sin(π/12)sin(3π/4) = cos(π/12 + 3π/4) = cos(π/12 + 9π/12) = cos(10π/12) = cos(5π/6)

Ah, now we have a trigonometry problem we can easily solve!

cos(5π/6) = -cos(π/6) = -(√3)/2

Hope this helps!

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