Question

Evaluate sin 15°×seec 75°

Answer 1

sec75= 1/cos75= 1/cos(90-15)=1/sin15

So sin15×sec75= sin15×(1/sin15)=1

Answer 2

Answer:1

Step-by-step explanation:

sin15×sec75=sin(90-75)×sec75

= Cos75×sec75

= 1/sec75 × sec75

=sec75 and sec75 cancel

Then answer is 1