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Valentin [98]
4 years ago
11

21x40=840, so 21x 42 = Use mental math

Mathematics
1 answer:
Bad White [126]4 years ago
8 0

Answer:

882

Step-by-step explanation:

mental math right ;)

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How are the arc length and circumference of a circle related?​
nikklg [1K]

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Hope it helps.

Step-by-step explanation:

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8 0
3 years ago
Prove that :-<br><br> Cos3A-cosA/sin3A-sinA+cos2A-cos4A/sin4A-sin2A=sinA/cos2Acos3A
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R_s=\dfrac{\sin A}{\cos A\cos^4A}=\dfrac{\sin A}{\cos A}\cdot\dfrac{1}{\cos^4A}=\tan A\cdot\dfrac{1}{\cos^4A}=\dfrac{\tan A}{\cos^4A}


\boxed{L_s\neq R_s}
8 0
3 years ago
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