Question

Is it true to say that sin tetha= cos tetha for all values of tetha? Justify your answer

Answer 1

Answer:

theta= 45°

Step-by-step explanation:

Given that

sin theta = cos theta

sin 45°= cos 45°

1/√2=1/√2

Answer 2

Answer:

(i) False

sin(A+B)=sinA+sinBA=45 o,B=45 o LHS: sin(45 o +45 o )=sin90 o =1RHS : sinA+sinB=

2 = 2

LHS  =RHS

(ii) Truesin0 o =0sin30o = 21 =sin45 o = 21 ,sin60 O = 23sin90 o =1∴θ increase ans value of sinθ also increase.

(iii) False cos0=1,cos30=13

cos45= 21cos60= 21

,cos90=0

Value of cosθ does not increase from 0<0<90o

(iv) False

This is true for θ=45 O

Let θ=90o

sin90=1,cos90=

(v) TruecotA= sinAcosA

cot0 o = sin0cos0 = 01 =not defined

Step-by-step explanation:

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