- How can i factor 25a^2 - b^2+4bd-4d^2?

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Does a loud sound have a larger vibration than a quiet sound? (PLEASE ANSWER QUICKLY)? What does it meant to dream of being a magnet to metallic objects? F(x)=[sin(3x)/sin(x)]-[cos(3x)/cos(x)]
a) For what values of x does f(x) not exist?
b) Simplify expression [sin(3x)/sin(x)]-[cos(3x)/cos(x)]? Who else saw Donald Trump stare at the sun without the eclipse glasses on the news? Somebody please help me with question c..?