Question

Find the range of theta if cos theta+ sin theta is positive

Answer 1

Answer: the answer is [-√2 , √2]

Step-by-step explanation:

There's a simple formula for that .

THE RANGE OF TRIGONOMETRIC FUNCTIONS SIN AND COS WHEN IN ADDITION WITH EACH OTHER IS GIVEN BY :

[ - √a²+b² , √a²+b²]

Where ,

a ,b ARE THE COEFFICIENTS OF THE FUNCTION

(HERE 1)

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