Answer:
A. cos( [tex]-\frac{\pi}{3}[/tex])
Step-by-step explanation:
Typed the all the expressions into desmos and picked the ones that matched
The expression cos (π/12)cos(5π/12) + sin (π/12)sin(5π/12) is equivalent to expression cos( π/3).
Trigonometric Ratios are ratios of the side of a right angled triangle. These are used to find the missing sides and angles of a right angled triangle.
The trigonometric expression is
⇒cos (π/12)cos(5π/12) + sin (π/12)sin(5π/12)
The trigonometric formula of cos (x-y) = cosx cosy +sinx siny
Here x = π/12 and y = 5π/12
cos (π/12)cos(5π/12) + sin (π/12)sin(5π/12) = cos ( π/12 - 5π/12)
=cos( -π/3)
= cos( π/3)
To know more about Trigonometric Ratios
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