Question

which of the six t- ratios are +ve for angle -420°​

Answer 1

Answer:

The six trigonometric ratios of a right angle triangle are Sin, Cos, Tan, Cosec, Sec and Cot. They stand for Sine, Cosine, Tangent, Cosecant, Secant, and Cotangent respectively. In the following section, we will learn the formulas for these trigonometric ratios.

Step-by-step explanation:

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Answer 2

Answer:

Only cosine and secant.

Step-by-step explanation:

We can say 420° = 60° (60=420-360)

Now among the six T-ratios, sin, tan, cosec, and cot are all odd functions, while cos and sec are all even functions.

We know, that f(-x) = -f(x) if it is odd function,

                               =  f(x) if  is even function.

So sin(-420°) = sin(-60°) = -sin60° (which is negative)

    cos(-420°) = cos(-60°) = cos60° (which is positive)

    tan(-420°) = tan(-60°) = -tan60° (which is negative)

    cot(-420°) = cot(-60°) = -cot60° (which is negative)

    sec(-420°) = sec(-60°) = sec60° (which is positive)

    cosec(-420°) = cosec(-60°) = -cosec60° (which is negative)

Hope it helps!!!!