120 Answered Questions for the topic Cosine

#### 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...
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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...
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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?

#### 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

02/27/19

#### How do you use the composite properties to show that an equation is an identity?

With this equation.cos(θ-180) = -cosθ

01/11/19

#### Trigonometry Question!

A weather ballon is tethered to the ground at an angle of inclination equal to 30°. The string used is 400ft long. Caleb and Elissa are at different positions on level ground in line with the...
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Cosine Math Help

07/14/18

#### question about cosine law

for the cosine law c^2= a^+b^2-2abcosc, is the value for c always the longest angle of the triangle, and if so, how do you know which side is the longest given only 2 sides and 1 angle?

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