Without using calculator, find the exact values of
sin 75° + sec150°.
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Answer:
sin75=sint
⇒ cos150=cos2t
On trig, unit circle
cos(150)=cos(180−30)=−cos30=−
2
3
cos150=
2
−
3
=1−2sin
2
t
2sin
2
t=
2
2+
3
sin(75)=sint=±
2
2+
3
Step-by-step explanation:
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