1. a and ß are acute angles in quadrant 1, with sin a =- and cos B = Determine the exact 5 25 value of cos(a -B). Show all of your work.

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Q: 3 sin B =- 5 5 0< A<- 13 Зл find the following: 3. If cos A = and t <B<- a. cos(A+B) b. sin(A+B)

A: topic - trigonometric identities cos(A+B)=cosAcosB-sinAsinB

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A: Since you have asked multiple question, we will solve the first question for you. If you want any…

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Q: Suppose that a and ß are in the first quadrant, sin(a) = , and sin(B) = . What is sin(a + B)?

A: cos2α=1-sin2α sinα+β=sinαcosβ+cosαsinβ

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A: Given the equation . The objective is to solve for .