Question 21. Solve the following trigonometric equation for the interval
(0,21].
18cos(x) - 9 = 0

step- i d k and i d c : )

you: : 0

bye

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6

in the simple case, the two triangles point x and y are congruent because every corresponding side has the same length, and every corresponding angle has the same measure.