Question

3sin^2 π/2-4tg^2 π/4-3cos^2 π/8+3ctg^2 π/2 AFLAȚI VALOAREA EXPRESIEI URGENT​

Answer 1

Explicație pas cu pas:

$= 3 \times {1}^{2} - 4 \times {1}^{2} - \frac{3 \times (1 + \frac{ \sqrt{2} }{2}) }{2} + 3 \times {0}^{2} = - \frac{3(2 + \sqrt{2}) }{2} - 1$