2+2x2^a x b */7 help me.

2+2x2^a x b*7

4x7 x 2a x b

28x 2a x b

2(a x b) x 28

56 x a x b

=56ab

or

2+2x2^a x b*7

4x7 x 2^a x b

28x a x a x b

2 x b x 28

56 x  b

=56b

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92