Answer:
the answer is 120 if that 2 is multiplication
6(7)=42
42(2)=84
+28
+8
= 120
Answer:
3/5
Step-by-step explanation:
First, multiply both tops and both bottoms so you have one fraction.
Reduce by dividing top and bottom by the same number.

12/20 becomes 3/5 because:
12÷4 =3
20÷4=5
Top and bottom are divided by same "scale factor", 4.
3 and 5 do not have any common factors other than 1, therefore 3/5 is the lowest term.
Remember:
sec t=1/cos t
sin²t+cos²t=1 ⇒sin²t=1-cos² t
Therefore:
cos t(sec t- cost)=(cos t* sec t)- cos² t=(cos t * 1/cos t)-cos² t=1-cos²t=sin² t
Answer: cos t(sec t-cos t)=sin² t