Introduction to Trigonometry
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If x=rcosθ.sinϕ,y=sinθ.sinϕ,z=rcosϕ Prove that x2+y2+z2=r2
The value of 1+sin(90o−A) cos(90o−A) +cos(90o−A) 1+sin(90o−A) is equal to :
If cotθ=87, evaluate cot2θ
Prove that following identities, where the angles involved are acute angles for which the trigonometric ratios as defined: cosθ/(1−tanθ)−sin2θ/(cosθ−sinθ)=cosθ+sinθ.
Without using trigonometric tables, evaluate:tan52o cot38o