Prove that 1/(3_√8)-1/(√8-√7) 1/(√7-√6)-1/(√6-√5) 1/(√5-2)=5
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HOW SHALL WE EVALUATE tan 118°, for example? We will see that we will be referred back to an acute angle. ... tan 120° = ±tan 60° = ± square root of 3 ... The corresponding acute angle of −45° (fourth quadrant) is 45°. ... What radian angle less than 2π is x? ... Therefore, cos (−θ) and cos θ will have the same sign:.
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