MHB How to Find Cosine from Secant Using Trig Identities?

courtbits
Messages
15
Reaction score
0
If $$\cos(\pi/3)= \frac{1}{2}$$, find $$\sec(\pi-\pi/3)$$

Someone really give me step-by-step explanation.
I really don't know what identity to use, and no idea how to get cosine to secant.
Please, it would help. I do have more questions if you help me dissect this problem. XD
Thanks so much in advance!
 
Mathematics news on Phys.org
courtbits said:
If $$\cos(\pi/3)= \frac{1}{2}$$, find $$\sec(\pi-\pi/3)$$

Someone really give me step-by-step explanation.
I really don't know what identity to use, and no idea how to get cosine to secant.
Please, it would help. I do have more questions if you help me dissect this problem. XD
Thanks so much in advance!

No idea how to get cosine from secant? By DEFINITION the secant is the reciprocal of the cosine...

$\displaystyle \begin{align*} \frac{1}{\cos{(x)}} \equiv \sec{(x)} \end{align*}$
 
Prove It said:
No idea how to get cosine from secant? By DEFINITION the secant is the reciprocal of the cosine...

$\displaystyle \begin{align*} \frac{1}{\cos{(x)}} \equiv \sec{(x)} \end{align*}$

Ok..
 

Thread 'What Exactly is Dirac’s Delta Function? - Insight'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
View full post »

Thread 'Fermat's Last Theorem'

Fermat's Last Theorem has long been one of the most famous mathematical problems, and is now one of the most famous theorems. It simply states that the equation $$ a^n+b^n=c^n $$ has no solutions with positive integers if ##n>2.## It was named after Pierre de Fermat (1607-1665). The problem itself stems from the book Arithmetica by Diophantus of Alexandria. It gained popularity because Fermat noted in his copy "Cubum autem in duos cubos, aut quadratoquadratum in duos quadratoquadratos, et...
View full post »
Thread 'Imaginary Pythagorus'

Thread 'Imaginary Pythagorus'

I posted this in the Lame Math thread, but it's got me thinking. Is there any validity to this? Or is it really just a mathematical trick? Naively, I see that i2 + plus 12 does equal zero2. But does this have a meaning? I know one can treat the imaginary number line as just another axis like the reals, but does that mean this does represent a triangle in the complex plane with a hypotenuse of length zero? Ibix offered a rendering of the diagram using what I assume is matrix* notation...
View full post »

Similar threads

MHB Trig Identity Problem: Solve cos2(x) + sin(x) = sin2(x) for 0^0<=x<=180^0
Replies
9
Views
3K
I badly with general answers to trig equations. (Using identities)
Replies
32
Views
3K
Using Euler's formula to prove trig identities using "sum to product" technique
Replies
4
Views
2K
MHB Finding the domain of this function.
Replies
5
Views
1K
MHB Evaluate Trig Expressions....Part 2
Replies
2
Views
2K
Trig identities and complex numbers help.
Replies
4
Views
3K
MHB Confused about a couple of trig. identities.
Replies
4
Views
3K
MHB Solving trig equation cos(x)=sin(x) + 1/√3
Replies
3
Views
3K
MHB Trigonometric Identities Problem
Replies
4
Views
2K
Help Understanding Trig Identity
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top