How many terms are in the binomial expansion of (3x + 5)9? 8 9 10 11

10

Step-by-step explanation:

We know that in the binomial expansion of , the total number of terms = n+1

For the binomial expansion of , n= 9

Then, the  total number of terms in binomial expansion of will be :-

Hence, there are 10  terms are in the binomial expansion of .

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