Rock B.

asked • 11/22/17

Trigonometry question

prove that
tan6.tan42.tan66.tan78=1

1 Expert Answer

By:

Andy C. answered • 11/22/17

Math/Physics Tutor

Rock B.

we are not allowed to directly substitute the value. 
can u help me with this:
(1-tan26)(1-tan266)= -4
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11/22/17

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