Question

Помогите найти значение выражения

Answer 1

Раскладываем по формуле разности кубов:

cos³ a-sin³ a=(cosa-sina)(сos²a+cosa*sina+sin²a)=
0.1*(cos²a+sin²a+cosa*sina)=
0.1*(1+cosa*sina)=0.1*(1+0.495)=0.1*1.495=0.1495

Находим значение выражения cosa*sina

cosa-sina=0.1 возводим в квадрат

(cosa-sina)²=0.01
cos²a-2cosa*sina+sin²a=0.01
(cos²a+sin²a)-0.01=2cosa*sina
1-0.01=2cosa*sina
0.99=2cosa*sina

cosa*sina=$\frac{0.99}{2} =0.495$

Answer 2

Finding the Meaning of an Expression

To help you find the meaning of the expression, I'll need more specific details about the expression you're referring to. Could you provide more context or details about the expression you need help with? This will help me provide you with the most accurate information.