Please help me with the circled questions A 1. Express as a single trigonometric function.(a) cos 2a cos a sin 2a sin a (b) cos x cos 4x + sin x sin 4x(c) sin 5 cos 2- cos 5 sin 2(d) sin 2m cos m + cos 2m sin mtan 2a + tan 3a(e)(g)(i)1-tan 2a tan 3acos² x sin² xtan x + tan x1- tan² x2. Evaluate using formulas developed in this section.13-2B (a) sin(b) cos125. If x is in the interval12اکار(e) sin 75°3. Find the value of each of the following.(a) sin(-)cos x = -and tan y =(a) sin(x + y)(b)a sin4. If x and y are in the interval (0.7) and sinx=and cos y =evaluate each of the following.(a) sin(x - y)(f)(h)()- sin(c) cos[(b) cos(x + y)TTUse the identity tan =(e) cos(g) sin(xcos(-7-7)(c)6. Find the exact value of each of the following.(a) sin 50° cos 20°cos 50° sin 20°म 4T(b) cos Cos4T2121tan 7° + tan 8°1 tan 7° tan 8°STT5TCOS36 18tan 7-tan 91+tan 7 tan 9sin a cos ca+ cos a sin acos¹ 2+ sin² 2(d) tan(-2)(f) cos(-15°)sinand y is in the interval, evaluate each of the following.cos(x - y) (c) tan(x - y)+ cos sin5T5T36 18Use the Addition Formula for Sine to prove the Subtraction Formulafor Sine, namely, sin(a - b) = sin a cos b- cos a sin b.sin e10. Prove each of the following.(a) sin(+ x) = -sin x13T2+ x) = sin xcos eTangent, namely tan(a - b) =(c) tan(x + y)+ x) = -sin xTT) = -sin xUse the Addition Formula for Tangent to prove the SubtractionFormula for Tangent.to prove the Subtraction Formula fortan a tan b1+tan a tan band(b) tan(2-x) = -tan x/3TT(d) sinT+=-COS X(f) tan(h) -tan(-x- π) = tan x=-cot x

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Express as a single trigonometric function. (a) cos 2a cos a (c) sin 5 cos 2 (d) sin 2mm - cos 5 sin 2 sin 2a sin a (b) cos x cos 4x + sin x sin 4x