Question

Evaluate: tan^2 30. sin 30 + cos 60. sin^2 90. tan^2 60 - 2. tan 45. cos^2 0. sin 90

Answer 1

ANSWER IS -1/3

TAN^2 30°=1/3

TAN^2 60°=3

COS0=1

SIN90=1

TAN45=1

SIN30°=1/2

COS60°=1/2

SUBSTITUTE IN QUESTION

1/3×1/2 + 1/2×3 -2×1×1×1 = 1/6 +3/2 -2

= 10/6 -2

=5/3-2 = 5/3-6/3 = -1/3