Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos (21°) – sin (21°) = cos(A°), then A degrees (b) If cos (8x) – sin²(8x) = cos(B), then B

Q: Find x if cos 53°= sin x. %3D (1) 90° (2) 127° (3) 53° (4) 370

A: To find x, if cos53°=sin x

Q: Find the exact value of each expression. (a) sin(40°) cos(20°) + cos(40°) sin(20°) (b) sin(75°) (c)…

A: Using formula, sinAcosB+cosAsinB=sinA+B in part (a) ,we have (a)-:…

Q: Cos?B Simplify Sin B + sin B

A:

Q: Using a double-angle or half-angle formula to simplify the given expressions (a) If cos (35°)- sin…

A: We have to find the angle

Q: If sinA=4/5 and cosB= -5/13, where A belongs to QI and B belongs to QIII, then find sin(A+B). How do…

A: Given that Where A in quadrant 1 and B in quadrant III

Q: Simplify the expression by using a Double-Angle Formula. (a) cos² (37°) - sin² (37⁰) cos 74 (b)…

A:

Q: An angle's initial ray points in the 3-o'clock direction and the angle measures radians. Which of…

A: It is given that an angle's initial ray points is in the 3-o'clock direction.

Q: In the figure below, a pole has two wires attached to it, one on each side, forming t right…

A: Given, Two right triangle with same height p. where a and b are length of the wire A and B…

Q: Determine whether the function f(r) = 4 tan(r) cos(r) is even, odd, or neither. i) Even ii) Odd iii)…

A: Given function, f(x)=4tan(x)cos(x)

Q: George drew a perpendicular line from ∠C to the opposite side in the diagram below.   He then did…

A: George drew a perpendicular line from ∠C to the opposite side in the diagram. He found out that…

Q: Let 0 be an angle in the first quadrant, and suppose sin (0) following expressions in terms of a.…

A: Hey, since there are multiple sub parts posted, we will answer first three sub parts. If you want…

Q: Use the Pythagorean Identity to write the double angle formula for cosine in two alternate forms by…

A:

Q: a. cos (sin-¹)

A: a. using property of inverse of If then from the question let then