# Homework Help: Trig identities

1. May 11, 2009

### fouracres

1. The problem statement, all variables and given/known data

cos+sintan/sinsec=csc

2. Relevant equations

3. The attempt at a solution
(cos+sin(sin/cos))/(sin/1/cos)
(cos+sin^2sincos)/(sin/cos)
(cos+sin^2sincos)X(cos/sin)

2. May 11, 2009

### arunbg

How did you go from
(cos+sin(sin/cos))/(sin/1/cos) to
(cos+sin^2sincos)/(sin/cos) ?

The cosine should become the LCM in the numerator.

3. May 11, 2009

### fouracres

i think i multiplied sin by sin and cos i wouldnt doubt that i did it wrong can u correct me i really would love to fix this !!!

4. May 11, 2009

### fouracres

where were u saying cos shud become the LCM in the numerator?

5. May 11, 2009

### Staff: Mentor

Have you ever heard of punctuation? The quote above appears to be three different sentences. Using periods at the ends of your sentences would make what you say easier to understand.

A similar problem exists with your first post (in addition to the omission of arguments of the functions shown):
As you have written it, most people in this forum would interpret the above as:
$$cos(x) + \frac{sin(x)tan(x)}{sin(x)sec(x)} = csc(x)$$

$$\frac{cos(x) +sin(x)tan(x)}{sin(x)sec(x)} = csc(x)$$