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What is the sin of pie over 2?
1
What is sin A equals 7 over 25?
It is a trigonometric equation. A = sin-1(7/25) = 0.284 radians.
What is the exact value of the expression cos 7pi over 12 cos pi over 6 -sin 7pi over 12 sin pi over 6?
cos(a)cos(b)-sin(a)sin(b)=cos(a+b) a=7pi/12 and b=pi/6 a+b = 7pi/12 + pi/6 = 7pi/12 + 2pi/12 = 9pi/12 We want to find cos(9pi/12) cos(9pi/12) = cos(3pi/4) cos(3pi/4)= cos(pi-pi/4) cos(pi)cos(pi/4)-sin(pi)sin(pi/4) cos(pi)=-1 sin(pi)=0 cos(pi/4) = √2/2 sin(pi/4) =√2/2 cos(pi)cos(pi/4)-sin(pi)sin(pi/4) = - cos(pi/4) = -√2/2
What is the perimeter of a triangle when its longest side is 162 mm with two of its angles being 37.25 degrees and 48.4 degrees?
Using the sine rule you can find the other two sides: Final angle = 180° - (37.25° + 48.4°) = 94.35° → other two sides are opposite the 37.25° and 48.4° angles as the longest side is opposite the largest angle. → the other two sides are: s1/sin 37.25° = 162mm / sin 94.35° → s1 = 162mm × sin 37.25°/sin 94.35° and s2 = 162mm × sin 48.4°/sin 94.35° → the perimeter = 162mm + 162mm × sin 37.25°/sin 94.35° + 162mm × sin 48.4°/sin 94.35° = 162mm (1 + (sin 37.25° + sin 48.4°)/sin 94.35°) ≈ 382 mm
What is the value sin x if cos x equals 2 over sqrt 5?
It would be 1 over square root 5.
