Which one is not an identity 1 cot2 x csc2 x sin2x cosx

Which one is not an identity? 1 + cot^2 x = csc^2 x sin^2x + cos^x = 1 1 + tan^2 x = 1/sin^2 x sin^2 x = 1 - cos^2 x What is the period of this function? y = 5 cot (3x) p = 3 pi p = pi/3 p = pi p = 2pi Find the amplitude y = -7 sin (x/3) A = -7 A = 7 A = 1/3 A = 3 Find the period. y = -cos (-3x) p = 2 pi/3 p = 2pi p = -2 pi/3 p = 3 pi Find tan 11 pi/6 -Squareroot 3 Squareroot 3 -Squareroot 3 Squareroot 3/3

Solution

5. All of them are identities except the c

So the correct option is c

6. y=5cot(3x)

Here A=5

B=3

Period=pi/B=pi/3

correct option is b

7.y= - 7 sin(x/3)

Here A=7

SO the amplitude=7

Hence the correct option is b