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Anushka Prasad Grade: 9
        


Which of the following is/are not correct? (more than one
correct)



a)   
tan(x+y)
= tan x + tan y/1-tan x .tan y



b)   
cos
2x = cos2x – sin2x



c)    
sin
2x = 2 tan x/ 1-tan2x



d)   
cos
3x = 4cos3x + 3cosx



5 years ago

Answers : (3)

Aman Bansal
592 Points
										

Dear Anushka


A,B,C are correct.



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5 years ago
Panga Mahita
37 Points
										

sin2x= 2tanx/1+tan2x          and cos3x = 4cos3x - 3cos x         


so c, d are incorrect answers


If understood then plz approve my answer.

5 years ago
ayan shanky
19 Points
										

answer  c,d

5 years ago
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