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Based on your knowledge of the electromagnetic spectrum, why are radio waves considered harmless while ultraviolet waves and x-rays considered harmful? A) Radio waves have longer wavelengths, lower frequency,
asked
Feb 10, 2017
Physics
high-school
2
answers
1
vote
65.1k
views
Rewrite with only sin x and cos x. sin (3x) - cos (x) Please guide me with showing work because the process of substituting is what I'm having difficulties with.
asked
Jan 17, 2017
Mathematics
high-school
1
answer
1
vote
187k
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