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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Help Me ! » trig question » 2010-11-28 07:31:45

Wow! I never would of got this, much thanks for your help!

#2 Re: Help Me ! » trig question » 2010-11-27 13:51:01

plugging in numbers?  Do you think there is a mistake?  This is from an old homework assignment, and it's an electronics class, there is just a little trig involved in the problem and I can't figure out the steps from getting from step 1 to step 2, the problem as a whole is larger than this, but I've been able to get this far.  I don't think there is a mistake here.

thanks

#3 Re: Help Me ! » trig question » 2010-11-27 13:38:17

Hi, yes that's it, i've been trying to plug in different identities but can't seem to get it that result

#4 Help Me ! » trig question » 2010-11-27 12:47:03

panfilero
Replies: 7

Hello,

I'm having trouble figuring out how my teacher got from this step, to this next step.

step 1:

15.5[0.866sin^2(2pi50t)+0.5(sin(2pi50t)cos(2pi50t)]

step 2:

6.71+7.75sin(2pi100t-60deg)

can anyone tell me what identities, or how the transition is made from step 1 to step 2.

much thanks!

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