Question

If 3cotA=4,then check whether 1-tan²A/1+tan²A=cos²A-sin²A​

Answer 1

Step-by-step explanation:

tanA = 3/4

cosA = 4/5

sinA = 3/5

Answer 2

Step-by-step explanation:

cotA= 4/3

tanA=3/4

sinA=3/5

cosA=4/5

1-tan^2 A/1+tan^2=1-(3/4)^2/1+(3/4)^2

=(1-9/16)/(1+9/16)

(16-9)/(16+9)=7/25

cos^2 A- sin^2 A=(4/5)^2-(3/5)^2

=16/25-9/25=7/25

1-tan^2 A/1+tan^2=cos^2 A- sin^2