It is given that sin a + sin b = /5/3 and cos a + cos b = 1. Determine the exact value of cos (a - b). %3D %3D O 1 O 1/3 O -2/3 O 8/3

Q: Which expression is equal to cos(6t)?

A: Recall:  cos(2t)=cos2(t)-sin2(t)     Given,   cos(6t)

Q: True or false: If cos A is negative, then cos (A/2) is negative as well.

A:

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A:

Q: Let sinA=-4/5 with A in QIII and cosB=-3/5 with B in QII. Anwer Exactly. Find sin(A-B), cos(A-B),…

A: Given,

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Q: Compute the exact value of cos (-7π/ 8) . Show work and do not use a calculator.

A:

Q: Use an identity to solve the equation cos 2x = cos x on the interval [0, 2π).

A: Given:cos2x=cosx on the interval [0,2π)Formula:cos2x=cos2x-sin2xsin2x=1-cos2x

Q: Go to your book on Section 5.2 problem set page 309 problem number 44. Find the exact answer for cos…

A:

Q: Show sin 3A = 3 sin A cos²A - sin A.

A: Explanation: Given that: sin3A=3sinAcos2A-sinA Concept: sin3A=3sinA-4sin3A sin2A+cos2A=1

Q: Find the value of the cos I

A: Given,