Question

give sin[90-a]=1/2,find without using trigonometric tables the values of tan²a

Answer 1

Answer:solution:

sin(90-a)=1/2

or,cos a=1/2[using CAST rule]

Therefore,sec a=1/cos a=2

We have,

sec^2 a-tan^2 a=1

or,tan^2 a=sec^2 a-1

=2^2 -1

=4-1

=3

Step-by-step explanation: