Question

2. IF 2 Cos 60%.cos10° = cos A + cos B
Then find the value of A
a) 50%
b) 35°
c) 70
d) 25
O
a
O
b
Ос
d​

Answer 1

Answer:

don't know ur questions answer

Answer 2

Answer:

The value of A is 70

Step-by-step explanation:

Given that:

2 Cos 60.cos10° = cos A + cos B

We know that cos X cos Y = $\frac{1}{2}$ * [cos (X + Y) + cos (X - Y)]

This can also be written as 2cosXcosY = cos (X + Y) + cos (X - Y)

On equating the given relation, we have,

X = 60

Y = 10

A = X + Y

Therefore, A = 60 + 10

                     = 70

Therefore, value of A is 70