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What is the range of y= cosx ? Please tell the method to find it .

please solve the query soon with full explanation .

thank you .

y = cos x. its range is -1 to 1. this can be understood by the graph and 

the graph of cos x is  as follows:

here angles are in radian.

hope this helps you.

cheers!! 

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the range is from -1 to 1 as

we can see that the ratio p/h(cos A) can not exceed 1 as perpendicular cant be more than its hypotenuse similarly if cos becomes negative it cant exceed -1 for the same reason

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