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What is the value of sin(−θ)sin(−θ) ?

 May 30, 2018
 #1
avatar+96302 
+1

cos ( - θ)  = cos ( θ )  = 4/5

 

Since  tan θ  and cos θ   >  0 , θ must be a first quadrant angle

 

So....sin θ  =  3/5

 

So.....sin (- θ)  = -sin (θ)  =  -3/5

 

 

 

cool cool cool

 May 30, 2018

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