DrStrangeLove
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 Jan13 awarded Popular Question Sep23 awarded Popular Question Aug31 awarded Nice Question Jul2 awarded Curious Mar14 awarded Popular Question May13 awarded Caucus Apr17 asked Matrix norm applications? Mar12 asked What are the differences between Hilbert's axioms and Euclid's axioms? Mar6 asked Is this recurrence relation correct? Jun25 awarded Yearling Jun8 awarded Caucus May26 comment How do I simplify this trig expression? @JoeL. is it possible to use (cos(2x)+cos(3x))⋅cosx ?? i calculated and found (for example,in degrees) cos(15)+cos(30) != cos(45) :( May26 asked How do I simplify this trig expression? May25 comment How to factor the quadratic polynomial $2x^2-5xy-y^2$? @TonyK i tried, but it didnt work.. :( May25 asked How to factor the quadratic polynomial $2x^2-5xy-y^2$? May19 accepted Simplifying trigonometric expression May19 comment Simplifying trigonometric expression At first time, i didnt notice.. :( Thanks a lot!!) May19 asked Simplifying trigonometric expression May18 asked Calculating $\tan15\cdot \tan 30 \cdot \tan 45 \cdot \tan 60 \cdot \tan 75$ May18 accepted How did they get this result?