given cos θ = 3/5, tan θ < 0 find: sin 2θ cos 2θ cot 2θ use half measure identities to find exact values of the following: tan 15 degrees sec π/12 THANK YOU SO MUCH!
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Originally Posted by pongpong given cos θ = 3/5, tan θ < 0 find: sin 2θ cos 2θ cot 2θ use half measure identities to find exact values of the following: tan 15 degrees sec π/12 THANK YOU SO MUCH! Since cos is positive and tan is negative , so the angle will be in quadrant 4 . Draw a triangle in quadrant 4 and find sin and tan .
Originally Posted by pongpong use half measure identities to find exact values of the following: tan 15 degrees tan 15 = tan 1/2(30) You can use this identity . $\displaystyle \tan\frac{\theta}{2}=\pm\sqrt{\frac{1-cos\theta}{1+cos\theta}} $ where $\displaystyle \theta $ is 30 . In this case , $\displaystyle \theta $ is in the first quadrant so it will be positive .
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