Callum Dudley
2022-06-29
Answered

Find the Maclaurin series for ${\mathrm{cos}}^{2}(x)$

You can still ask an expert for help

Dalton Lester

Answered 2022-06-30
Author has **12** answers

We have, ${\mathrm{cos}}^{2}x=\frac{1}{2}+\frac{1}{2}(1-\frac{(2x{)}^{2}}{2!}+\frac{(2x{)}^{4}}{4!}-\frac{(2x{)}^{6}}{6!}+...)$

asked 2021-08-20

P(x, y) is the endpoint of the unit circle determined by t. Then $\mathrm{sin}t=,\mathrm{cos}t=,\text{}\text{and}\text{}\mathrm{tan}t=$.

asked 2021-08-11

Find the Value of each trigonometric ratio to the radical form if necessary.

asked 2022-01-25

Proof that $\sum _{n=1}^{\mathrm{\infty}}\frac{{(-1)}^{n+1}\mathrm{sin}\left(n\right)}{n}=\frac{1}{2}$

asked 2022-04-01

Solving $a\mathrm{sin}\theta +b\mathrm{cos}\theta =c$

I know that the solution is

$\theta ={\mathrm{tan}}^{-1}\frac{c}{{}_{-\sqrt{{a}^{2}+{b}^{2}-{c}^{2}}}^{+}}-{\mathrm{tan}}^{-1}\frac{a}{b}$

I know that the solution is

asked 2022-04-28

Prove $\mathrm{sin}(\alpha -\beta )+\mathrm{sin}(\alpha -\gamma )+\mathrm{sin}(\beta -\gamma )=4\mathrm{cos}\frac{\alpha -\beta}{2}\mathrm{sin}\frac{\alpha -\gamma}{2}\mathrm{cos}\frac{\beta -\gamma}{2}$

asked 2022-01-16

Solving ${\frac{58}{\mathrm{cot}36}}^{\circ}={\mathrm{cos}}^{3}x$ without substituting the trig values for $36}^{\circ$

asked 2022-05-21

If real numbers x and y fit the equality $\frac{2x+i}{y+i}=\frac{1+i\mathrm{sin}\alpha}{1+i\mathrm{sin}3\alpha}$, what does $\frac{x}{y}$ equal?