Question

Cos (п/4-a).............. ​

Answer 1

Удачиииииии!!!!!!!!!!!

Answer 2

To calculate the value of cos(π/4 - a), we can use the trigonometric identity:

cos(π/4 - a) = cos(π/4) * cos(a) + sin(π/4) * sin(a)

The values of cos(π/4) and sin(π/4) are both equal to 1/√2.

So, cos(π/4 - a) = (1/√2) * cos(a) + (1/√2) * sin(a)

Keep in mind that the value of a is not provided in your question, so I can't give you an exact numerical answer without knowing the value of 'a'. If you provide a specific value for 'a', I can help you calculate the result.