Question

Cos38°⋅cos17°−sin38°⋅sin17°=

Answer 1

Ответ:

$\cos(38 ^{0} + {17}^{0} ) = \cos( {55}^{0} )$

Answer 2

Cos(38+17)
cos(55) - ответ

Answer 3

To calculate the value of cos(38°)⋅cos(17°) - sin(38°)⋅sin(17°), you can use the trigonometric identity for the cosine of the difference of two angles:

cos(A - B) = cos(A)cos(B) + sin(A)sin(B)

In this case, A = 38° and B = 17°. Plugging these values into the identity:

cos(38° - 17°) = cos(38°)cos(17°) + sin(38°)sin(17°)

Now, calculate the individual trigonometric values:

cos(38° - 17°) = cos(21°) ≈ 0.927

So, cos(38°)⋅cos(17°) - sin(38°)⋅sin(17°) is approximately equal to 0.927.