ทบทวนสูตรตรีโกณมิติ(ม.5)

Question 1

sin(​-	heta​)  เท่ากับข้อใด

Accepted Answer

1

Question 2

สูตร cos(A-B) = ??

Accepted Answer

cosAcosB+sinAsinB

Question 3

cos2A = ​\cos^2A-\sin^2A​  ใช่หรือไม่

Accepted Answer

o

Question 4

​\sin^2	heta+\cos^2	heta​ มีค่าเท่าใด

Accepted Answer

1

Question 5

​2\sin	heta\cos	heta​ ตรงกับข้อใด

Accepted Answer

3

Question 6

​\sin A\cos B-\cos A\sin B​

Accepted Answer

sin(A-B)

Question 7

​\frac{	an A+	an B}{1-	an A	an B}=???​

Accepted Answer

1

Question 8

​\cos70+\cos80+\sin90-\sin20-\sin10​

Accepted Answer

2

Question 9

​\cos^2A-1=???​

Accepted Answer

1

Question 10

​3\sin A-4^{}\sin^3A​

Accepted Answer

2

Question 11

​\sqrt{\frac{1+\cos A}{2}}​

Accepted Answer

0

Question 12

sin(A+B)+sin(A-B)  ตรงกับข้อใด

Accepted Answer

2

Question 13

​2\cos\left(\frac{A+B}{2}\right)\cos\left(\frac{A-B}{2}\right)​

Accepted Answer

0

Question 14

sin150 - cos60

Accepted Answer

0

Question 15

​\frac{2	an A}{1-	an^2A}​

Accepted Answer

0