how can learn trick in trigo formula?
Answers
Step-by-step explanation:
Practice as much as you can: This may sound like an obvious point, but the more you practice using the formulas you need to know, the more likely you are to remember the same. List down all important formulas on a sheet and whenever you are free, glance at them once. After all, repetition leads to memorization.
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Answer:
First thing , you can bet that you know it, (sinx)^2+(cosx)^2=1
that means
(sinx)^2= 1-(cosx)^2
and tanx= sinx/cosx
sin(a+b)=sincos+cossin and in the same way sin(a-b)=sincos-cossin (learn them like this sincos +cossin , no need to learn sinacosb+cosasinb)
cos(a+b)=coscos-sinsin “ remember in cos(a+b) there - ”
If you know these, tell me anything, it will come out from them:
sin(π/2 +x)= sincos+sincos
= sin(π/2)cosx+cos(π/2)sin(x)
= (1)cosx+(0)sin(x)
=cosx
I do not even learn them, when I need them I take them out in 3 seconds.
cos(π/2 +x)= coscos-sinsin
= cos(π/2)cos-sin(π/2)sin(x)
= (0)cosx-(1)sin(x)
=-sinx
What do you want more, write in comment if you feel anything difficult:
sin(a+b)=sinacosb+cosasinb
sin(a-b)=sinacosb-cosasinb
so sin(a+b)+sin(a-b)=2 sinacosb
so sinacosb=(1/2)[sin(a+b)+sin(a-b)]
Who said I have to learn them? I did not say that.
I was tooooooo lazy in math, but I can solve now most of questions in math, so have a look in my profile and see that I enjoy solving math question and eat them like a chocolate .
I can feel how much you feel, so just tell me what do you want and I will help you.