trigonometry

trigonometry

I'm having trouble solving the above question, as well as the one below tan20+tan10/1-tan20tan10=

the problem is stated as above. I'm just not sure where to start.

tan5(*pie symbol)/ 6

1. Find the exact value of cos(t/2) if sin(t) = -7/25 and pi < t < 3pi/2 2. Find all the solutions in the interval [0,360] cos(2x)= - sqr...

sin 450°, cos(-780°), and tan (37π/6)

tan 7π/8

Consider the equation cos(3.14t)=-0.7. Find the smallest positive solution in radians and round your answer to 4 decimal places Consider the equation tan(3.25t)-6.6. Find the smallest...

the line x-2y+16=0 is tangent to a circle at (0,8). The line y=2x-1 is tangent to the same circle at (3,5). What is the center(ordered pair) of the circle?

Suppose you want to approximate the function f(x)=(x−2)2+4f(x)=(x−2)2+4 at x=3x=3. Given a line with slope mm through the point (a,b)(a,b), what is the point-slope form of the line?

The diagonals of a rhombus bisect each other and cross at right angles.

The measure of the angle from a line l1, with slope -1/3 to a line l2 is 135°. Find the slope of the line l2?

Okay, so my but shows e^ integral tanx to be e^ln|secx|. as far as I know, the integral of tanx is -ln|COSx|. how do they do that?

In triangle XYZ, the measure of angle Y is 90°, YZ=12, and XZ=15. Triangle HJK is similar to triangle XYZ, where vertices X, Y, and Z, respectively, and each side of triangle HJK is 1/5 the length...

If cos t/sin t=1/3, then what's tan t?

A ladder leans against a wall with its foot 1.5 metres from the wall making for an angle of 45º36' with the ground. How long is the ladder?

solve on the interval [0,2(pie)). The square root is just on the top 3 not the whole fraction.

Find number of points where tangents does not exist for the curve y =sgn(x2 -1 )

Angles α and β are between 0° and 360° with cos α = -0.9063 and tan β = -0.4877. Which of the following is a possible (approximate) value for α + β? A) 51° B) 129° C) 309° D) 361°...

If the tangent from point p to circle x2+y2=1 is perpendicular to the tangent from p to be circle x2+y2=3, then locus of p is ? A circle of radius _

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