Trigonometric Ratios of 90 Degree Plus Theta

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How do you find the exact value of sin(-90)?

SOLUTION: T-ratios of allied angles,Mathe trigonometry formula

The value of cot 0 - sin (90° - 0) cos(90° - 0) is​

What are the values of sin 30, sin 60, sin 45, and sin 90 in

Prove rightarrow sin (90^{o}-theta)cos (90^{o}-theta)=dfrac {tan theta}{1+tan ^{2}theta}