Question

I don't know the answer either I will try to do . anyways you are awesome....​

Answer 1

Answer:

4. Seven sheep were left

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Taking L.H.S,

1 - cos(a)

V1+ cos(a)

1+ cos(a) 1+cos(a) 1+ cos(a)

1-cos(a)

Use the identities :

• (a+b)(a-b)=a²-b? (a+b)(a+b) = (a+b)

1 COS-a

1+cos(a)

sin (a)

2 1+ cos(a)

sin(a) 1+ cos(a) {proved}

Some formulas :

* sin2A + cos?A = 1

* 1 + tan?A = sec?A =

*1 + cotA= cosec2A

* cos?A - sin?A = cos2A

* sin(A+B) = sinAcosB +

cosAsinB

* sin(A-B) = sinAcosB -

cosAsinB

* cos(A+B) = cosAsinB sinAsinB

* cos(A-B) = cosAsinB + sinAsinB

* tan(A + B)

tanA + tanB 1- tanAtanB

*tan(A-B) = tanA - tanB

1+tanAtanB

* sin20 = 2sin Øcos

* cos20 = 2cos2 0-1

* cos20 = 1 - 2 sin20