X=10 the two triangles are the same size just one is scaled down by 1/2. Hope this helps
Answer:
Ou seja, nesse caso, 15 reais para cada uma, escrevendo de uma maneira mais simples:
" 15 para as duas"
E assim obtemos a resposta, a letra b) 1:45, pois são 15 para as duas.
Step-by-step explanation:
Answer 1200
Step-by-step explanation:
Answer:
see explanation
Step-by-step explanation:
Using the sum to product identity
cosx + cosy = 2cos(
)cos(
)
Consider left side
(cos5A +cos3A) + (cos15A + cos7A)
= 2cos(
)cos(
) + 2cos(
) cos(
)
= 2cos(
) cos(
) + 2cos(
)cos(
)
= 2cos4AcosA + 2cos11A cos4A ← factor out 2cos4A from both terms
= 2cos4A( cos11A + cosA) ← repeat the process
= 2cos4A( 2cos(
)cos(
)
= 2cos4A(2cos(
)cos(
)
= 2cos4A(2cos6A cos5A)
= 4cos4Acos5Acos6A
= right side , thus verified