126 Answered Questions for the topic Cosine

02/11/21

12/07/20

#### Pre Calculus Question

Given 𝑠𝑖𝑛𝜃 = −1 and 𝑐𝑜𝑠𝜃 > 0, find (a) 𝑠𝑖𝑛2𝜃, and (b) 𝑐𝑜𝑠2𝜃

12/07/20

#### What is the max. temperature (Celsius) that occurs on the second day?

f(t) = 18-4cos(π/12(t+1))t stands for the hour

10/18/20

#### If sin A = 2/3 and sin B = 1/3 , and A and B are in quadrant I, find sin (A + B).

I need solutions and the steps. I cannot understand it even after researching for hours.

08/30/20

#### I need help figuring out how to solve this

A gasoline and air mixture is ignited by spark plugs, which forces the pistons to move up and down, rotating the crankshaft. The animation on the left shows a single piston moving up and... more

05/18/20

#### Law of sines and cosines

Find b, given a=10 , c=8 and m<B=40o

05/18/20

#### Law of sines and cosines

In Triangle ABC, m<A=30o , m<B=80o , a=18in. Find the length of C.

05/15/20

#### Given cos(t)=-7/25 for pi/2 < t < pi, find the value of sin (t)

I appreciate all of the tutors and experts on here, thanks so much for saving me and many other students.

04/04/20

#### are sine and cosine equal for non-acute complementary angles?

for example, when writing a proof, is it logical to write the following:cos(-ø)=sin(π/2+ø) (∵ the cosine of an angle is equal to the sine of its complementary angle)I ask because this... more

03/18/20

#### Trignometric Functions

Find the value of each trigonometric function using the given angle and a calculator. Round answers to three decimal places.Cos 77 °

12/04/19

#### Given Cos (2x)= -24/25, 2nd Quadrant (pi/2 <x< pi); What is Sin(x) ?

Am I missing something big here? I've gotten around to making sin(2x)=7/25 but I don't understand how to go from double angle to single angle using identities.

11/26/19

#### Consider the work below for verifying the given identities. One step in each identity is missing. Fill in the box showing the correct work for the missing step

First Stepcot θ sec θ csc2 θ - cot3 θ sec θ = csc  θSecond Step (missing step)Third Stepcot θ sec θ (1) = csc θFourth Stepcos θ 1------- * ------ = csc θsin θ... more

11/26/19

#### If sinx cosx = 2/5 and tan x = 1/2, then sin^2x =

If sinx cosx = 2/5 and tan x = 1/2, then sin2 x= A. 1/5 B. 2/5 C. sqrt(5)/5 D. 2sqrt(5)/5 E. 3/5

07/09/19

#### Write −6sin(8t)+5cos(8t) in the form Asin(Bt+ϕ) using sum or difference formulas.

-6sin(8t)+5cos(8t)= Please provide all steps! Thank You!

07/09/19

#### If cos^2sin^4x= A+Bcos2x+Ccos4x+Dcos2xcos4x, then A= B= C= D=

Please tell me how you got it by showing steps!! what does A, B, C, and D equal in the second equation?
Cosine Algebra 2 Sine

07/08/19

#### Sine and Cosine

Why can sine and cosine never be greater than 1?

07/08/19

#### Sine Cosine and Tangent

Why can sine and cosine never be greater than 1? Why is it that cosecant and secant should be greater than 1? Why are tangent and cotangent sometimes undefined?

07/07/19

#### If sinx+cosx=sqrt(2)sin(x+Aπ), then the number 0<A=___________ <2

please provide all steps for the solution

07/07/19

#### Use the product to sum formula to fill in the blanks in the identity below: sin(7x)cos(4x)=1/2(sin(_____x)+sin(______x))

please provide all steps for the solution

07/07/19

#### Use the product-to-sum formula to find the exact value: If cos37.5∘sin7.5∘=(√A−B)/4, then A= B=

please provide all steps for the solution

07/07/19

#### Use the product-to-sum formula to find the exact value: If 2sin52.5∘sin97.5∘=2√+A√2, then A=

please provide all steps for the solution

07/07/19

#### Use the sum-to-product formula to simplify the expression: If sin41∘+sin19∘=sinA∘,0<A<90, then A= ____degrees

please provide all steps for the solution!!!!

07/02/19

#### Express in terms of x: sin(2arctan(x))

PLEASE give clear steps! Thank You!If the answers ends up having square roots, can you simply it where it does not

07/02/19

#### Find tan(arcsin(4/6) + arccos(10/17))

PLEASE show clear steps!!If the answers ends up having square roots, can you simply it where it does not

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