Express the following as a single sine, cosine or tangent: a sin 15 cos 20 + cos

Express the following as a single sine, cosine or tangent:

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a sin 15° cos 20° + cos 15° sin 20° c cos 130° cos 80° - sin 130° sin 80° e cos 20 cos 0 + sin 20 sin g sin 10 cos 20 + cos sin 2-10 i sin (A + B) cos B - cos (A + B) sin B 2y 3x - 2y i cos (3x +2¹) cos (³x = 2¹) - 2 sin b sin 58° cos 23° - cos 58° sin 23° tan 76° tan 45° 1 + tan 76° tan 45° f cos 40 cos 30 - sin 40 sin 30 tan 20+ tan 30 1 tan 20 tan 30 d h 3x 2y - (³x +2¹) sin (3x - 2¹) 2