maths  trigonometry
posted by anonymous .
I have my maths exam on Tuesday and cannot remember how to do trigonometric identities at all. I was so sure, but now I'm not. I asked a similar question earlier, but I still don't quite understand. Please give me stepbystep instructions?
[sinx + tanx] / [cosx +1] = tanx

I just got done with thi stuff and these are the formulas that helped me with alot.
tan(angle)=opposite/adjacent
coa(angle)=adjacent/hypotenuse
sin(angle)=opposite/hypotenuse
Is this what your asking for? 
that's sort of a tricky one,
[sinx + tanx] / [cosx +1] = tanx
LS = (sinx + tanx)/(cosx+1) [(cosx1)/cosx1)]
= (sinxcosx  sinx + sinx  sinx/cosx)/(cos^2x  1)
= [ (sinxcos^2x  sinx)/cosx]/(cos^2x  1)
= sinx[cos^2x  1)/cosx] / (cos^2x  1)
= sinx/cosx
= tanx
= RS
Respond to this Question
Similar Questions

Maths
Can someone give me the checkpoint exam topics that are required for a student to revise Please give us more and clearer context for your question. It is not clear what you want to know. What exam topics? 
Trigonometry
I don't understand how I'm supposed set the problem up or what theta is... Use the given function value(s), and trigonometric identities (including the cofunction identities), to find the indicated trigonometric functions. sec theta … 
trig
Why do you have to leave one side alone when proving a sentence to be true? 
Math
Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 … 
maths
I'm reviewing for my exams, and I was sure that I was comfortable with solving trigonometric identities, but now that I'm looking at ones on my review, I'm not so sure. Could someone please show me, step by step, how to answer one? 
Trigonometric Identities
Which of the following are trigonometric identities, I have narrowed it down to two  (cscx + cotx)^2 = 1 OR sin^2(x)sec^2(x) + 1 = cot^2(x)csc^2(x) 
Trigonometry
Use the properties of logarithms and trigonometric identities to verify the identity. lncot x = lncos x  lnsin x I have no idea where to begin with this one... your help is appreciated! 
Trigonometry
Google this: 5.1 using fundamental identities Comcast Click and open the first result that appears on your search (Result= PDF Document). Textbook pages will appear and go to page 383 on problem #129. The directions will mention "Solve … 
Trigonometry  Proofs
Prove that the average of the numbers n sin (n degrees) (n = 2, 4, 6, ... 180) is cot (1 degree) Hint: Express everything in terms of sin and cos. Can you rearrange the result into a form that allows you to use some of the identities … 
Maths Question
the slope of a curve y=f(x) is given by dy/dx= (x1)(x2)^2(x3)^3(x4)^4(x5)^5 for what value or values of x does y have a local maximum/miniumum?