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Question #11657

prove that tan(60+A).tan(60-A)=2cos2A+1/2cos2A-1

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**1.**if 2tan(alpha)=3tan(beta), prove that tan(alpha-beta)=sin(2beta)/5-cos(2beta)**2.**prove that a)cos(90-/theta)cosec(90-/theta)=tan/theta**3.**Cos70=h and sin35=k, express in terms of h and/or k, Cos149=?**4.**(cosA-sinA+1) / (cosA+sinA-1) = cosecA+cotA**5.**asin(B-C)+bsin(C-A)+csin(A-B)**6.**find the value of 1/2 tan(θ/2) + 1/4 tan(θ/4) + 1/8 tan(θ/8)+...+1/(2…**7.**1.) A circle of area 24 square units has a sector of area 10 square units. Calculate th…

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