 # Get help with trigonometric equations and identities

Recent questions in Trigonometric equations and identities Gretchen Allison 2022-09-05

### Show that the subset S = {0,2,4,6,8} of Z10 is a subring. Does S have identity? cyrilicesj 2022-09-05

### Complete the identity.$\mathrm{sin}\left(x+\frac{3\pi }{2}\right)=$? Ciolan3u 2022-09-05

### Solve the identy. $\frac{1+\mathrm{sin}2x}{\mathrm{cos}x+\mathrm{sin}x}=\frac{\mathrm{cos}2x}{\mathrm{cos}x-\mathrm{sin}x}$ Damon Cowan 2022-09-04

### Prove the following Identity: $\frac{{\mathrm{sin}}^{2}x-4\mathrm{sin}x+3}{{\mathrm{cos}}^{2}x}=\frac{3-\mathrm{sin}x}{1+\mathrm{sin}x}$ ureq8 2022-09-04

### Complete the identity. ${\mathrm{sin}}^{2}\theta /2=$? Jimena Hatfield 2022-09-03

### Give the exact value of:a. $\mathrm{cos}\left({\mathrm{sin}}^{-1}\left(-.5\right)\right)$b. ${\mathrm{cos}}^{-1}\left(\mathrm{cos}7\pi /6\right)$ FoomyBiamy5 2022-09-02

### Use the opposite angle or periodicity identities to answer.$\frac{\mathrm{cos}\left(\frac{3\pi }{2}\right)\mathrm{sin}\left(6\pi \right)}{\mathrm{sin}\left(\frac{19\pi }{2}\right)\mathrm{tan}\left(\frac{21\pi }{4}\right)}$ moidu13x8 2022-09-02

### a)$\mathrm{cos}\left(17\pi /6\right)$ and b)$\mathrm{tan}\left(15\pi /4\right)$Use the opposite angle identities and or periodicity identities to evaluate the following. Gaige Haynes 2022-09-02

### Solve. $\frac{\mathrm{cos}x}{1-\mathrm{tan}x}﻿+\frac{\mathrm{sin}x}{1-\mathrm{cot}x}=\mathrm{cos}x+\mathrm{sin}x$ hetjurnar02 2022-09-02

### Prove the following identity: $\frac{1-\mathrm{cos}x}{\mathrm{sin}x}+\frac{\mathrm{sin}x}{1-\mathrm{cos}x}=2\mathrm{csc}x$ Expositur3e 2022-08-31

### Use the opposite angle or periodicity identities to answer.$\frac{\mathrm{tan}\left(\frac{11\pi }{4}\right)\mathrm{cos}\left(\frac{19\pi }{6}\right)}{\mathrm{sin}\left(\frac{31\pi }{3}\right)}$ Soren Wright 2022-08-22

### How to prove these identities are true?1)$\mathrm{sin}\left(2\theta \right)=2\mathrm{sin}\left(\theta \right)\mathrm{cos}\left(\theta \right)$2)$\mathrm{cos}\left(2\theta \right)={\mathrm{cos}}^{2}\theta -{\mathrm{sin}}^{2}\theta \phantom{\rule{0ex}{0ex}}=1-2{\mathrm{sin}}^{2}\theta \phantom{\rule{0ex}{0ex}}=2{\mathrm{cos}}^{2}\theta -1$3)$\mathrm{tan}2\theta =\frac{2\mathrm{tan}\theta }{1-{\mathrm{tan}}^{2}\theta }$ traquealwm 2022-08-18

### Solve equations $0\le \theta <2\pi$a)$4\sqrt{3}=6\mathrm{cos}\theta$b)$-2+\mathrm{cos}\theta =\frac{-4-\sqrt{2}}{2}$c)$-4=4\mathrm{cos}\theta$d)$-2=-4\mathrm{sin}\theta$ Eisregiony1 2022-08-18

### We can use identities to help us solve trigonometric equations.Using a Pythagorean identity we see that the equation $\mathrm{sin}\left(x\right)+{\mathrm{sin}}^{2}\left(x\right)+{\mathrm{cos}}^{2}\left(x\right)=1$ is equivalent to the basic equation _________ whose solutions are x = ________ for any integer k. boske9s 2022-08-18

### Topic: Trigonometric Identities Competencies: determine whether an equation is an identity or a conditional equation, apply trigonometric identities to find other trigonometric values, and solve situational problems involving trigonometric identities Finley Mcintosh 2022-08-18

### Use a half-angel formula to find the exact value of $\mathrm{sin}\frac{5\pi }{8}$ Paulkenyo 2022-08-17

### Verify the identity $\mathrm{tan}×{\mathrm{csc}}^{2}x–\mathrm{tanx}=\mathrm{cot}x$ empalhaviyt 2022-08-08

### Solve. $\mathrm{sin}x=.2x$ Massatfy 2022-08-05

### Solve. $\mathrm{tan}x-\mathrm{sin}x=\left(\mathrm{tan}x\left(\mathrm{sin}x{\right)}^{2}\right)/\left(\mathrm{cos}x+1\right)$ Samson Kaufman 2022-08-04

### Given: $\theta \in \left[\pi /2,\pi \right]$ and $\mathrm{tan}\theta =1/3$.Find $\mathrm{sin}\theta$ and $\mathrm{cos}\theta$ (but to find the angle is not needed)

The majority of students do not like Trigonometry because they find all the questions and equations overly complex. Do not let it frighten you because we have lots of answers that will help you achieve solutions by turning to already existing tasks. We have practical works on all the twelve trigonometric identities and equations with 45 formulas that you can apply in your work. Since you can take a look at the resolved assignments, you will become a trigonometric identities and equations solver that can start with the formulas and continue with the graphics, analytical calculation, and related word problems.