Question

sin30 (cos60)-tan2sq45

Answer 1

Step-by-step explanation:

Sin30(Cos60) - tan²45

Sin30(Sin30) - tan²45

Sin²30 - 1

(1/2)² - 1

(1/4) - 1

= -3/4

Answer 2

Step-by-step explanation:

cos60 = cos90-30

as cos90-θ= sinΘ

cos90-30=sin30

sin30 cos60 = sin^30

sin^2(30)=(1/2)^2=1/4

tan^2(45)=1^2=1

so

sin30 (cos60)-tan2sq45=1/4-1 = -3/4

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