All categories

2 years ago

Someone help me with this ASAP!!

Mathematics

2 answers:

deff fn [24]2 years ago

7 0

Part 3 is going to be 3.5

omeli [17]2 years ago

6 0

thats all right but part 3 of 3 is 7.5

You might be interested in

Show that √(1-cos A/1+cos A) =cosec A - cot A

Gennadij [26K]

Hi there!

$\sqrt{\frac{1-cosA}{1+cosA}} =$

We can begin by multiplying by its conjugate:

$\sqrt{\frac{1-cosA}{1+cosA}} * \sqrt{\frac{1+cosA}{1+cosA}} = \\\\\sqrt{\frac{(1-cosA)(1 + cosA)}{(1+cosA)(1 + cosA)}} =$

Simplify using the identity:

$1 - cos^2A = sin^2A$

$\sqrt{\frac{(1-cos^2A)}{(1+cosA)^2}} =\\\\\sqrt{\frac{(sin^2A)}{(1+cosA)^2}} =$

Take the square root of the expression:

${\frac{sinA}{1+cosA} =$

Multiply again by the conjugate to get a SINGLE term in the denominator:

${\frac{sinA}{1+cosA} * {\frac{1-cosA}{1-cosA} =\\$

Simplify:

${\frac{sinA(1-cosA)}{1-cos^2A} =$

Use the above trig identity one more:

${\frac{sinA(1-cosA)}{sin^2A} =$

Cancel out sinA:

${\frac{(1-cosA)}{sinA} =$

Split the fraction into two:

${\frac{1}{sinA} - \frac{cosA}{sinA} =$

Recall:

$1/sinA = cscA\\\\cosA/sinA = cotA$

Simplify:

$\frac{1}{sinA} + \frac{cosA}{sinA} = \boxed{cscA - cotA}$

5 0

2 years ago

Find the circumference of a circle with radius 63mm

aleksandr82 [10.1K]

Circumference = 2 * PI * radius
Circumference = 2 * 3.14159265 * 63
Circumference = 395.841

3 0

3 years ago

HELP!!!!! PLEASE!!!!!

emmainna [20.7K]

Answer:

Step-by-step explanation:

It's a pythagorean triple

8 0

2 years ago

Read 2 more answers

211135.711111 write this in cash price (dollars)

aleksklad [387]

211,135.71 merry christmas

5 0

2 years ago

52.68 feet per hour convert to inches

Ede4ka [16]

632.16 inches per hour is the answer. Find the conversion rate of feet to inches, which is just 1 foot = 12 inches. Then, multiply 52.68 by 12 to get the answer.
Hope this helped.

8 0

3 years ago