Answer:
-9.17 = x
Step-by-step explanation:
1.87 = x + 11.04
Subtract 11.04 from each side
1.87-11.04 = x + 11.04-11.04
-9.17 = x
If 25% of the cupcakes were chocolate, she would have bought <u>6 chocolate cupcakes</u>
I don't really understand this question do u have a pic
Answer:21
Step-by-step explanation:9+10=21
1)
LHS = cot(a/2) - tan(a/2)
= (1 - tan^2(a/2))/tan(a/2)
= (2-sec^2(a/2))/tan(a/2)
= 2cot(a/2) - cosec(a/2)sec(a/2)
= 2(1+cos(a))/sin(a) - 1/(cos(a/2)sin(a/2))
= 2 (1+cos(a))/sin(a) - 2/sin(a)) (product to sums)
= 2[(1+cos(a) -1)/sin(a)]
=2cot a
= RHS
2.
LHS = cot(b/2) + tan(b/2)
= [1 + tan^2(b/2)]/tan(b/2)
= sec^2(b/2)/tan(b/2)
= 1/sin(b/2)cos(b/2)
using product to sums
= 2/sin(b)
= 2cosec(b)
= RHS
