The value of tan 45° =
1/2
1 ⁄ √2
1
√3 ⁄ 2
If cosθ + sinθ = √2 cosθ, then, cosθ - sinθ =
sinθ
2sinθ
√2 sinθ
2 sin²θ
sin ( A + B ) =
sinA cosB - cosA sinB
sinA cosB + cosA sinB
sinA sinB + cosA cosB
sinA sinB - cosA cosB
A straight line contains
135°
90°
360°
180°
sin² 30° + cos² 60° = ______ .
1 ⁄ 3
If sinθ = ½ , then 3cosθ - 4 cos3θ =
cosθ
cos²θ
0
45° is a / an
obtuse angle
acute angle
right angle
straight line
If sinθ =12 ⁄ 13 and θ is acute, then cosθ =
5 ⁄ 13
1 ⁄ 13
4 ⁄ 9
2 ⁄ 3
tan² 45° + 2 tan² 60° =
13
3
5
7
A sexagecimal measure of 72° is equal in circular measure to