Question

please answer this question ​

Answer 1

Step-by-step explanation:

pi = 180°

= sin² 180/6 + cos² 180/3 - tan²180 /4

= sin² 30 + cos² 60 - tan² 45

= sin² ( 1/2) + cos² (1/2) - tan²(1)

= 1/4 +1/4 -1

= 1/2 -1

= -1/2