Question

prove :- tan 70=tan 20+2tan50

Answer 1

tan 70 = tan(50+20)
=>tan 70= (tan 50 + tan20)/(1-tan50* tan20)
=>tan 70- tan 70*tan50*tan20 = tan 50 +tan20
=>tan 70- tan 50 =tan50+tan20 (Since, tan 70 * tan 20 =1)
=>tan 70 = 2tan50 +tan20

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Answer 2

Answer:

tan 70 = 2tan50 +tan20

Step-by-step explanation:

tan 70 = tan(50+20)

tan 70= (tan 50 + tan20)/(1-tan50* tan20)

tan 70- tan 70*tan50*tan20 = tan 50 +tan20

tan 70- tan 50 =tan50+tan20 (Since, tan 70 * tan 20 =1)

tan 70 = 2tan50 +tan20