Chứng minh các biểu thức sau không phụ thuộc vào x
2(sin^6x + cos^6x)-3(cos^4x + sin^4x)

step-by-step explanation:

the shape,the size and the distance

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°

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step-by-step explanation: