A.
B. \(1\)
C. \(2cos^2x\)
D. \(2sin^2x\)
A.
B. \(2sin^275^o\)
C. \(sin^275^o\)
D. \(2sin75^o\)
A. \(\sqrt{3}+1\)
B. \(\sqrt{3}-1\)
C. \(\sqrt{3}+2\)
D. \(\sqrt{3}-2\)
A. \(sin45^o\)
B. \(2cos77^o\)
C. \(102cos88^o\)
D. không xác định
A. \(0,5\)
B. \(0,6\)
C. \(0,8\)
D. \(1\)
A. sin2α+sin2(90o-α)=0
B. sin2α+sin2(90o-α)=2
C. sin2α+sin2(90o-α)=1
D. sin2α+sin2(90o-α)=3
A. \(\left( {\overrightarrow {AC} ,\overrightarrow {BD} } \right) = {90^ \circ },\left( {\overrightarrow {MB} ,\overrightarrow {OC} } \right) = {135^ \circ }\)
B. \(\left( {\overrightarrow {AC} ,\overrightarrow {BD} } \right) = {180^ \circ },\left( {\overrightarrow {MB} ,\overrightarrow {OC} } \right) = {45^ \circ }\)
C. \(\left( {\overrightarrow {AC} ,\overrightarrow {BD} } \right) = {90^ \circ },\left( {\overrightarrow {MB} ,\overrightarrow {OC} } \right) = {45^ \circ }\)
D. \(\left( {\overrightarrow {AC} ,\overrightarrow {BD} } \right) = {0^ \circ },\left( {\overrightarrow {MB} ,\overrightarrow {OC} } \right) = {135^ \circ }\)
A. 1/5
B. -1/5
C. 1/25
D. -1/25
A. \(\sin {150^ \circ } = \frac{{\sqrt 3 }}{2},c{\rm{os}}{150^ \circ } = - \frac{1}{2},\tan {150^ \circ } = - \sqrt 3 ,\cot {150^ \circ } = - \frac{1}{{\sqrt 3 }}\)
B. \(\sin {150^ \circ } = \frac{{\sqrt 3 }}{2},c{\rm{os}}{150^ \circ } = -\frac{1}{2},\tan {150^ \circ } = \sqrt 3 ,\cot {150^ \circ } = \frac{1}{{\sqrt 3 }}\)
C. \(\sin {150^ \circ } = \frac{1}{2},c{\rm{os}}{150^ \circ } = \frac{\sqrt{3}}{2},\tan {150^ \circ } = \frac{1}{\sqrt{3}} ,\cot {150^ \circ } = {\sqrt 3 }\)
D. \(\sin {150^^\circ } = \frac{1}{2},c{\rm{os}}{150^^\circ } = - \frac{{\sqrt 3 }}{2},\tan {150^^\circ } = - \frac{1}{{\sqrt 3 }},\cot {150^^\circ } = - \sqrt 3 \)
A. (1;0)
B. (0;1)
C. (-1;0)
D. (0;-1)
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