Đưa phương trình sau về dạng chính tắc:
(∂^2 z)/〖∂x〗^2 +2 (∂^2 z)/∂x∂y+(∂^2 z)/〖∂y〗^2 =0

The surface area of the triangular prism is .

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). −5x3 + 11x2 − 2 5x3 − 11x2 + 2 x3 + 2x2 + x3 x3 − 2x2 − x3