subebe
16. sin(45+A) + sin(45-A) = 2sin 1/2(45 +A +45 - A) cos 1/2(45+A - 45 +A) = 2sin 45 cos A = 2 x √2/2 cos A = √2 cos A (Jawab D) 17. = 2 cos 1/2(45+A+45-A) sin 1/2(45+A-45+A) = 2 cos 45 sin A = 2 √2/2 sin A = √2 sin A (Jawab E) 18. cos (45 +A) - cos (45 - A) = -cos (45 - A) + cos (45 +A) = 2 sin 1/2 (45 - A +45+A) sin 1/2 (45 - A -45 -A) = 2 sin 45 sin - A = 2 √2/2 sin -A =√2 sin -A = - √2 sin A (Jawab B) 19. = 2cos 1/2(45+A+45-A) cos 1/2 (45 +A -45 +A) = 2 cos 45 cos A =2 √2/2 cosA = √2 cos A (Jawab D)
= 2sin 45 cos A
= 2 x √2/2 cos A
= √2 cos A (Jawab D)
17. = 2 cos 1/2(45+A+45-A) sin 1/2(45+A-45+A)
= 2 cos 45 sin A
= 2 √2/2 sin A
= √2 sin A (Jawab E)
18. cos (45 +A) - cos (45 - A) = -cos (45 - A) + cos (45 +A)
= 2 sin 1/2 (45 - A +45+A) sin 1/2 (45 - A -45 -A)
= 2 sin 45 sin - A
= 2 √2/2 sin -A
=√2 sin -A
= - √2 sin A (Jawab B)
19. = 2cos 1/2(45+A+45-A) cos 1/2 (45 +A -45 +A)
= 2 cos 45 cos A
=2 √2/2 cosA
= √2 cos A (Jawab D)