Question

Q5
If sin a + 7 sin b = 4 (sin c + 2 sin d) and
cos a + 7 cos b = 4 (cos c + 2 cos d), where
cos(a-d)
a, b, c, d e [0, 1], then the value of
cos(b-c)
is
O
2
)
AN
O
O​

Answer 1

Answer:

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Step-by-step explanation:

The answer is 2