Question

3sin^2x-7cos^2x=?
sinx=0.1​

Answer 1

Ответ:

$= 3 { \sin(x) }^{2} - 7(1 - { \sin(x) }^{2} ) = 3 { \sin(x) }^{2} - 7 + 7 { \sin(x) }^{2} = 10 { \sin(x) }^{2} - 7 = 10 \times {0.1}^{2} - 7 = - 6.9$