Question

sin^2 30+ tan^2 45- sec^2 60
please
help ​

Answer 1

Answer:

-13/4

Step-by-step explanation:

sin^2 30+ tan^2 45- sec^2 60

= (sin 30)^2 + (tan 45)^2 - (sec 60)^2

= 1/4 + 1/2 -4

= 3/4 - 4

= 3-16 / 4 = -13/4

Answer 2

Answer:

Step-by-step explanation:

sin 30° = 1/2

tan 45° = 1

sec 60° = 2

∴ sin² 30° + tan² 45° - sec² 60° = ( 1/2 )² + ( 1 )² - ( 2 )²

= 1/4 + 1 - 4

= ( 1 + 4 - 16 ) / 4

= - 11 / 4 is the answer.