Use the addition and subtraction theorem:
sin (A + B) = sin A + cos B
sin (A - B) = sin A - cos B
From there it's just a matter of simplification.
sin A cos B = 1/2 [ sin (A + B) + sin (A - B) ]
sin A cos B = 1/2 [ sin A cos B + cos A sin B + sin (A - B) ]
sin A cos B = 1/2 [ sin A cos B + cos A sin B + sin A cos B - cos A sin B ]
sin A cos B = 1/2 [ 2 sin A cos B ]
sin A cos B = sin A cos B
Answer:
c
Step-by-step explanation:
Answer 4.6/5. 20
Step-by-step explanation: . lizcocch. Beginner. 2 answers. 11 people helped. The second expression, (16-8)x2+4, has a value of 20.
Answer:
3 and 7
Step-by-step explanation:
For problems like these I take the largest number in this case 10, and start writing out what 2 numbers would give me 10. 0+10, 1+9, 2+8, 3+7...while doing that I subtract the numbers as well. thus 3+7=10 3-7=-4
False
If the 3 sides form a right triangle then the square of the longest side must equal the sum of the squares of the 2 other sides.
28² = 784
26² + 12² = 674 + 144 = 818 ≠ 784
Thus sides do not form a right triangle.
