Please someone help me, youvmust find the value of:

1

Step-by-step explanation:

Using the sum to product formulae and the exact values

sin x + sin y = 2sin( )cos( )

cos x + cos y = 2cos( )cos( )

sin45° = cos45° = , cos30° =

Given

=

=

= (2 × × ) ÷ (2 × × )

= 1

 1

Step-by-step explanation:

sin 75 = sin(30 + 45) = sin30 · cos45  + cos30 · sin45

sin 15 = sin(45 - 30) = sin45 · cos30  - cos45 · sin30

cos 75 = cos(30 + 45) = cos30 · cos45  - sin30 · sin45

cos 15 = cos(45 - 30) = cos45 · cos30  + sin45 · sin30

366

step-by-step explanation:

y = 5x + 17

step-by-step explanation:

a perpendicular line will be the opposite reciprocal slope of the given equation.   the slope given is -1/5 so the opposite reciprocal is 5

find b:

7 = 5 (-2) + b

7 = -10 + b

17 = b

write equation

y = 5x + 17